diff --git a/conan/tools/cmake/toolchain/blocks.py b/conan/tools/cmake/toolchain/blocks.py
index 8f9a2c85236..ca8a85e383b 100644
--- a/conan/tools/cmake/toolchain/blocks.py
+++ b/conan/tools/cmake/toolchain/blocks.py
@@ -879,6 +879,12 @@ def context(self):
             # To set CMAKE_<LANG>_COMPILER
             if comp in compilers_by_conf:
                 compilers[lang] = compilers_by_conf[comp]
+        compiler = self._conanfile.settings.get_safe("compiler")
+        if compiler == "msvc" and "Ninja" in str(self._toolchain.generator):
+            # None of them defined, if one is defined by user, user should define the other too
+            if "c" not in compilers_by_conf and "cpp" not in compilers_by_conf:
+                compilers["C"] = "cl"
+                compilers["CXX"] = "cl"
         return {"compilers": compilers}
 
 
diff --git a/conan/tools/gnu/autotoolstoolchain.py b/conan/tools/gnu/autotoolstoolchain.py
index e5fed44cb05..a251caa70d0 100644
--- a/conan/tools/gnu/autotoolstoolchain.py
+++ b/conan/tools/gnu/autotoolstoolchain.py
@@ -231,6 +231,12 @@ def environment(self):
                         # https://github.com/conan-io/conan/issues/13780
                         compiler = unix_path(self._conanfile, compiler)
                         env.define(env_var, compiler)
+            compiler_setting = self._conanfile.settings.get_safe("compiler")
+            if compiler_setting == "msvc":
+                # None of them defined, if one is defined by user, user should define the other too
+                if "c" not in compilers_by_conf and "cpp" not in compilers_by_conf:
+                    env.define("CC", "cl")
+                    env.define("CXX", "cl")
 
         env.append("CPPFLAGS", ["-D{}".format(d) for d in self.defines])
         env.append("CXXFLAGS", self.cxxflags)
diff --git a/test/functional/toolchains/cmake/test_cmake_toolchain.py b/test/functional/toolchains/cmake/test_cmake_toolchain.py
index f8592601199..de31d29aa1f 100644
--- a/test/functional/toolchains/cmake/test_cmake_toolchain.py
+++ b/test/functional/toolchains/cmake/test_cmake_toolchain.py
@@ -230,6 +230,8 @@ def test_cmake_toolchain_cmake_vs_debugger_environment():
                            f"$<$<CONFIG:Release>:{release_bindir}>" \
                            f"$<$<CONFIG:MinSizeRel>:{minsizerel_bindir}>;%PATH%"
     assert debugger_environment in toolchain
+
+
 @pytest.mark.tool("cmake")
 def test_cmake_toolchain_cmake_vs_debugger_environment_not_needed():
     client = TestClient()
@@ -243,7 +245,6 @@ def test_cmake_toolchain_cmake_vs_debugger_environment_not_needed():
     assert "CMAKE_VS_DEBUGGER_ENVIRONMENT" not in toolchain
 
 
-
 @pytest.mark.tool("cmake")
 def test_cmake_toolchain_multiple_user_toolchain():
     """ A consumer consuming two packages that declare:
diff --git a/test/functional/toolchains/gnu/autotools/test_win_bash.py b/test/functional/toolchains/gnu/autotools/test_win_bash.py
index d26647fced2..6a04132c3be 100644
--- a/test/functional/toolchains/gnu/autotools/test_win_bash.py
+++ b/test/functional/toolchains/gnu/autotools/test_win_bash.py
@@ -21,7 +21,6 @@ def test_autotools_bash_complete():
         [conf]
         tools.microsoft.bash:subsystem=msys2
         tools.microsoft.bash:path=bash
-        tools.build:compiler_executables={{"c": "cl", "cpp": "cl"}}
         """)
 
     main = gen_function_cpp(name="main")
diff --git a/test/functional/toolchains/gnu/test_v2_autotools_template.py b/test/functional/toolchains/gnu/test_v2_autotools_template.py
index d4ee48731f3..afd56049d6b 100644
--- a/test/functional/toolchains/gnu/test_v2_autotools_template.py
+++ b/test/functional/toolchains/gnu/test_v2_autotools_template.py
@@ -352,7 +352,6 @@ def test_msys2_autotools_windows(self):
             [conf]
             tools.microsoft.bash:subsystem=msys2
             tools.microsoft.bash:path=bash
-            tools.build:compiler_executables={"c": "cl", "cpp": "cl"}
             """)
         c.save({"msys2": msys2})
         # FIXME: Need to deactivate test_package because AutotoolsDeps doesn't work in Win
@@ -369,7 +368,6 @@ def test_msys2_autotools_exe_windows(self):
             [conf]
             tools.microsoft.bash:subsystem=msys2
             tools.microsoft.bash:path=bash
-            tools.build:compiler_executables={"c": "cl", "cpp": "cl"}
             """)
         c.save({"msys2": msys2})
         c.run("create . -pr=msys2")