diff --git a/CHANGES/896.misc.rst b/CHANGES/896.misc.rst
new file mode 100644
index 00000000..9dbd6db4
--- /dev/null
+++ b/CHANGES/896.misc.rst
@@ -0,0 +1 @@
+Restrict including routers with strings
diff --git a/aiogram/dispatcher/router.py b/aiogram/dispatcher/router.py
index a1a20fba..9f1c0f77 100644
--- a/aiogram/dispatcher/router.py
+++ b/aiogram/dispatcher/router.py
@@ -4,7 +4,6 @@ import warnings
 from typing import Any, Dict, Generator, List, Optional, Set, Union
 
 from ..types import TelegramObject
-from ..utils.imports import import_module
 from ..utils.warnings import CodeHasNoEffect
 from .event.bases import REJECTED, UNHANDLED
 from .event.event import EventObserver
@@ -211,8 +210,6 @@ class Router:
         :param router:
         :return:
         """
-        if isinstance(router, str):  # Resolve import string
-            router = import_module(router)
         if not isinstance(router, Router):
             raise ValueError(
                 f"router should be instance of Router not {type(router).__class__.__name__}"
diff --git a/tests/test_dispatcher/test_router.py b/tests/test_dispatcher/test_router.py
index 56821f46..7f98e971 100644
--- a/tests/test_dispatcher/test_router.py
+++ b/tests/test_dispatcher/test_router.py
@@ -5,7 +5,6 @@ from aiogram.dispatcher.router import Router
 from aiogram.utils.warnings import CodeHasNoEffect
 
 pytestmark = pytest.mark.asyncio
-importable_router = Router()
 
 
 class TestRouter:
@@ -46,14 +45,10 @@ class TestRouter:
         with pytest.warns(CodeHasNoEffect):
             assert router1.include_router(router2)
 
-    def test_include_router_by_string(self):
-        router = Router()
-        router.include_router("tests.test_dispatcher.test_router:importable_router")
-
     def test_include_router_by_string_bad_type(self):
         router = Router()
         with pytest.raises(ValueError, match=r"router should be instance of Router"):
-            router.include_router("tests.test_dispatcher.test_router:TestRouter")
+            router.include_router(self)
 
     def test_set_parent_router_bad_type(self):
         router = Router()
diff --git a/tests/test_utils/test_imports.py b/tests/test_utils/test_imports.py
deleted file mode 100644
index e877201c..00000000
--- a/tests/test_utils/test_imports.py
+++ /dev/null
@@ -1,29 +0,0 @@
-import pytest
-
-import aiogram
-from aiogram.utils.imports import import_module
-
-
-class TestImports:
-    def test_bad_type(self):
-        with pytest.raises(ValueError, match=r"Target should be string not"):
-            import_module(42)
-
-    @pytest.mark.parametrize("value", ["module", "module:", ":attribute"])
-    def test_bad_format(self, value):
-        with pytest.raises(ValueError, match='must be in format "<module>:<attribute>"'):
-            import_module(value)
-
-    @pytest.mark.parametrize("value", ["module", "aiogram.KABOOM", "aiogram.KABOOM.TEST"])
-    def test_bad_value(self, value):
-        with pytest.raises(ValueError, match="Could not import module"):
-            import_module(f"{value}:attribute")
-
-    def test_has_no_attribute(self):
-        with pytest.raises(ValueError, match="has no attribute"):
-            import_module("aiogram:KABOOM")
-
-    def test_imported(self):
-        value = import_module("aiogram:__version__")
-        isinstance(value, str)
-        assert value == aiogram.__version__