diff --git a/packages/mui-system/src/createStyled/createStyled.d.ts b/packages/mui-system/src/createStyled/createStyled.d.ts
index 458a2b653ef98f..651fd020de5135 100644
--- a/packages/mui-system/src/createStyled/createStyled.d.ts
+++ b/packages/mui-system/src/createStyled/createStyled.d.ts
@@ -38,4 +38,4 @@ export default function createStyled<Theme extends object = DefaultTheme>(option
   styleFunctionSx?: typeof styleFunctionSx;
 }): CreateMUIStyled<Theme>;
 
-export function applyStyled(props: any, componentName: string, overridesResolver: Function): string;
+export function internal_applyStyled(props: any, componentName: string, overridesResolver: Function): string;
diff --git a/packages/mui-system/src/createStyled/createStyled.js b/packages/mui-system/src/createStyled/createStyled.js
index 247963f2fb486e..6f041af6ab2bc5 100644
--- a/packages/mui-system/src/createStyled/createStyled.js
+++ b/packages/mui-system/src/createStyled/createStyled.js
@@ -241,15 +241,12 @@ export default function createStyled(input = {}) {
   return styled;
 }
 
-export function applyStyled(props, componentName, overridesResolver) {
-  const styles = applyThemeOverrides(props, componentName, overridesResolver);
-
-  // NOTE: Later on, we might want to apply other MUI features:
-  // const styles = [
-  //   applyThemeOverrides(props, componentName, overridesResolver),
-  //   applyThemeVariants(props, componentName),
-  //   applySystemSx(props, componentName),
-  // ]
+export function internal_applyStyled(props, componentName, overridesResolver) {
+  const styles = [
+    applyThemeOverrides(props, componentName, overridesResolver),
+    applyThemeVariants(props, componentName),
+    // applySystemSx(props, componentName),
+  ]
 
   return css(styles);
 }