diff --git a/python/src/com/jetbrains/python/psi/types/PyImportedModuleType.java b/python/src/com/jetbrains/python/psi/types/PyImportedModuleType.java
index 19f247d4a4bf..0aaa054c8b6c 100644
--- a/python/src/com/jetbrains/python/psi/types/PyImportedModuleType.java
+++ b/python/src/com/jetbrains/python/psi/types/PyImportedModuleType.java
@@ -15,16 +15,17 @@
  */
 package com.jetbrains.python.psi.types;
 
+import com.google.common.collect.Sets;
 import com.intellij.codeInsight.lookup.LookupElement;
+import com.intellij.openapi.util.Condition;
 import com.intellij.psi.PsiDirectory;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiFile;
+import com.intellij.psi.PsiFileSystemItem;
 import com.intellij.util.ArrayUtil;
 import com.intellij.util.ProcessingContext;
-import com.jetbrains.python.psi.AccessDirection;
-import com.jetbrains.python.psi.PyExpression;
-import com.jetbrains.python.psi.PyFile;
-import com.jetbrains.python.psi.PyUtil;
+import com.intellij.util.containers.ContainerUtil;
+import com.jetbrains.python.psi.*;
 import com.jetbrains.python.psi.impl.PyImportedModule;
 import com.jetbrains.python.psi.resolve.PointInImport;
 import com.jetbrains.python.psi.resolve.PyResolveContext;
@@ -36,6 +37,7 @@ import org.jetbrains.annotations.Nullable;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Set;
 
 /**
  * @author yole
@@ -57,6 +59,20 @@ public class PyImportedModuleType implements PyType {
     if (resolved != null) {
       final PsiFile containingFile = location != null ? location.getContainingFile() : null;
       List<PsiElement> elements = Collections.singletonList(ResolveImportUtil.resolveChild(resolved, name, containingFile, false, true));
+      final PyImportElement importElement = myImportedModule.getImportElement();
+      if (location != null && importElement != null && PyUtil.inSameFile(location, importElement) &&
+          ResolveImportUtil.getPointInImport(location) == PointInImport.NONE && resolved instanceof PsiFileSystemItem) {
+        final List<PsiElement> importedSubmodules = PyModuleType.collectImportedSubmodules((PsiFileSystemItem)resolved, location);
+        if (importedSubmodules != null) {
+          final Set<PsiElement> imported = Sets.newHashSet(importedSubmodules);
+          elements = ContainerUtil.filter(elements, new Condition<PsiElement>() {
+            @Override
+            public boolean value(PsiElement element) {
+              return imported.contains(element);
+            }
+          });
+        }
+      }
       return ResolveImportUtil.rateResults(elements);
     }
     return null;
diff --git a/python/src/com/jetbrains/python/psi/types/PyModuleType.java b/python/src/com/jetbrains/python/psi/types/PyModuleType.java
index cd642a6910cf..d057b70c6ed3 100644
--- a/python/src/com/jetbrains/python/psi/types/PyModuleType.java
+++ b/python/src/com/jetbrains/python/psi/types/PyModuleType.java
@@ -388,7 +388,8 @@ public class PyModuleType implements PyType { // Modules don't descend from obje
                                                                               @NotNull PsiElement location,
                                                                               @Nullable final Set<String> existingNames) {
 
-    return ContainerUtil.mapNotNull(collectImportedSubmodules(pyPackage, location),
+    final List<PsiElement> elements = collectImportedSubmodules(pyPackage, location);
+    return elements != null ? ContainerUtil.mapNotNull(elements,
                                     new Function<PsiElement, LookupElement>() {
                                       @Override
                                       public LookupElement fun(PsiElement element) {
@@ -400,10 +401,10 @@ public class PyModuleType implements PyType { // Modules don't descend from obje
                                         }
                                         return null;
                                       }
-                                    });
+                                    }) : Collections.<LookupElement>emptyList();
   }
 
-  @NotNull
+  @Nullable
   public static List<PsiElement> collectImportedSubmodules(@NotNull PsiFileSystemItem pyPackage, @NotNull PsiElement location) {
     final PsiElement parentAnchor;
     if (pyPackage instanceof PyFile && PyUtil.isPackage(((PyFile)pyPackage))) {
@@ -413,7 +414,7 @@ public class PyModuleType implements PyType { // Modules don't descend from obje
       parentAnchor = pyPackage;
     }
     else {
-      throw new IllegalArgumentException("Package argument should be either standard Python package or namespace package");
+      return null;
     }
 
     final ScopeOwner scopeOwner = ScopeUtil.getScopeOwner(location);
diff --git a/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/a.py b/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/a.py
deleted file mode 100644
index 6de874dee44a..000000000000
--- a/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/a.py
+++ /dev/null
@@ -1,5 +0,0 @@
-import pkg1.m1
-
-print(pkg1.m2)
-print(pkg1.<warning descr="Cannot find reference 'nonexistent' in 'imported module pkg1'">nonexistent</warning>)
-
diff --git a/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/__init__.py b/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/__init__.py
deleted file mode 100644
index 8b137891791f..000000000000
--- a/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/m1.py b/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/m1.py
deleted file mode 100644
index 123f7cbbfd9d..000000000000
--- a/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/m1.py
+++ /dev/null
@@ -1 +0,0 @@
-import pkg1.m2
diff --git a/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/m2.py b/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/m2.py
deleted file mode 100644
index 8b137891791f..000000000000
--- a/python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/m2.py
+++ /dev/null
@@ -1 +0,0 @@
-
diff --git a/python/testData/inspections/PyUnresolvedReferencesInspection3K/NotImportedSubmodulesOfNamespacePackage/main.py b/python/testData/inspections/PyUnresolvedReferencesInspection3K/NotImportedSubmodulesOfNamespacePackage/main.py
new file mode 100644
index 000000000000..54e2273f4550
--- /dev/null
+++ b/python/testData/inspections/PyUnresolvedReferencesInspection3K/NotImportedSubmodulesOfNamespacePackage/main.py
@@ -0,0 +1,5 @@
+import nspkg1.m2
+
+print(nspkg1.m2)
+print(nspkg1.<warning descr="Cannot find reference 'm3' in 'imported module nspkg1'">m3</warning>)
+print(nspkg1.<warning descr="Cannot find reference 'nssubpkg1' in 'imported module nspkg1'">nssubpkg1</warning>)
diff --git a/python/testData/inspections/PyUnresolvedReferencesInspection3K/NotImportedSubmodulesOfNamespacePackage/nspkg1/m2.py b/python/testData/inspections/PyUnresolvedReferencesInspection3K/NotImportedSubmodulesOfNamespacePackage/nspkg1/m2.py
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/python/testData/inspections/PyUnresolvedReferencesInspection3K/NotImportedSubmodulesOfNamespacePackage/nspkg1/m3.py b/python/testData/inspections/PyUnresolvedReferencesInspection3K/NotImportedSubmodulesOfNamespacePackage/nspkg1/m3.py
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/python/testData/inspections/PyUnresolvedReferencesInspection3K/NotImportedSubmodulesOfNamespacePackage/nspkg1/nssubpkg1/m1.py b/python/testData/inspections/PyUnresolvedReferencesInspection3K/NotImportedSubmodulesOfNamespacePackage/nspkg1/nssubpkg1/m1.py
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/python/testData/inspections/unusedImport/unusedSubmodule/p1/__init__.py b/python/testData/inspections/unusedImport/unusedSubmodule/p1/__init__.py
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/python/testData/inspections/unusedImport/unusedSubmodule/p1/m1.py b/python/testData/inspections/unusedImport/unusedSubmodule/p1/m1.py
new file mode 100644
index 000000000000..a43e3eb876c1
--- /dev/null
+++ b/python/testData/inspections/unusedImport/unusedSubmodule/p1/m1.py
@@ -0,0 +1 @@
+a1 = 42
\ No newline at end of file
diff --git a/python/testData/inspections/unusedImport/unusedSubmodule/p1/m2.py b/python/testData/inspections/unusedImport/unusedSubmodule/p1/m2.py
new file mode 100644
index 000000000000..97f0eb4ade34
--- /dev/null
+++ b/python/testData/inspections/unusedImport/unusedSubmodule/p1/m2.py
@@ -0,0 +1 @@
+a2 = -1
\ No newline at end of file
diff --git a/python/testData/inspections/unusedImport/unusedSubmodule/test1.py b/python/testData/inspections/unusedImport/unusedSubmodule/test1.py
new file mode 100644
index 000000000000..40e9e79d3ac1
--- /dev/null
+++ b/python/testData/inspections/unusedImport/unusedSubmodule/test1.py
@@ -0,0 +1,3 @@
+import p1.m1
+
+print(p1.<warning descr="Cannot find reference 'm2' in 'imported module p1'">m2</warning>.a2)
diff --git a/python/testSrc/com/jetbrains/python/inspections/Py3UnresolvedReferencesInspectionTest.java b/python/testSrc/com/jetbrains/python/inspections/Py3UnresolvedReferencesInspectionTest.java
index 9cdac1dd034b..1a29300f947d 100644
--- a/python/testSrc/com/jetbrains/python/inspections/Py3UnresolvedReferencesInspectionTest.java
+++ b/python/testSrc/com/jetbrains/python/inspections/Py3UnresolvedReferencesInspectionTest.java
@@ -112,6 +112,11 @@ public class Py3UnresolvedReferencesInspectionTest extends PyTestCase {
     doTest();
   }
 
+  // PY-14385
+  public void testNotImportedSubmodulesOfNamespacePackage() {
+    doMultiFileTest("main.py");
+  }
+
   // PY-15017
   public void testClassLevelReferenceInMethodAnnotation() {
     doTest();
diff --git a/python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java b/python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java
index 6e0c1b333f7a..59a93465d995 100644
--- a/python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java
+++ b/python/testSrc/com/jetbrains/python/inspections/PyUnresolvedReferencesInspectionTest.java
@@ -510,10 +510,7 @@ public class PyUnresolvedReferencesInspectionTest extends PyInspectionTestCase {
     doTest();
   }
 
-  // PY-14615
-  public void testImplicitlyImportedSubModule() {
-    doMultiFileTest();
-  }
+
 
   @NotNull
   @Override
diff --git a/python/testSrc/com/jetbrains/python/inspections/PyUnusedImportTest.java b/python/testSrc/com/jetbrains/python/inspections/PyUnusedImportTest.java
index 1ce20f386adf..018d75e8fbde 100644
--- a/python/testSrc/com/jetbrains/python/inspections/PyUnusedImportTest.java
+++ b/python/testSrc/com/jetbrains/python/inspections/PyUnusedImportTest.java
@@ -38,6 +38,11 @@ public class PyUnusedImportTest extends PyTestCase {
     doTest("test1.py");
   }
 
+  // PY-5621
+  public void testUnusedSubmodule() {
+    doTest("test1.py");
+  }
+
   // PY-6380
   public void testUnusedAfterStarImport() {
     doTest("test1.py");