diff --git a/packages/core/src/core_private_export.ts b/packages/core/src/core_private_export.ts
index 98595d9b27..41a2a4d67c 100644
--- a/packages/core/src/core_private_export.ts
+++ b/packages/core/src/core_private_export.ts
@@ -13,7 +13,7 @@ export {devModeEqual as ɵdevModeEqual} from './change_detection/change_detectio
 export {isListLikeIterable as ɵisListLikeIterable} from './change_detection/change_detection_util';
 export {ChangeDetectorStatus as ɵChangeDetectorStatus, isDefaultChangeDetectionStrategy as ɵisDefaultChangeDetectionStrategy} from './change_detection/constants';
 export {Console as ɵConsole} from './console';
-export {inject, setCurrentInjector as ɵsetCurrentInjector, Δinject} from './di/injector_compatibility';
+export {inject, setCurrentInjector as ɵsetCurrentInjector, ɵɵinject, Δinject} from './di/injector_compatibility';
 export {getInjectableDef as ɵgetInjectableDef, ΔInjectableDef as ΔInjectableDef, ΔInjectorDef} from './di/interface/defs';
 export {APP_ROOT as ɵAPP_ROOT} from './di/scope';
 export {ivyEnabled as ɵivyEnabled} from './ivy_switch';
diff --git a/packages/core/src/di/index.ts b/packages/core/src/di/index.ts
index 02f2ed5631..1733f522a0 100644
--- a/packages/core/src/di/index.ts
+++ b/packages/core/src/di/index.ts
@@ -14,11 +14,11 @@
 
 export * from './metadata';
 export {InjectFlags} from './interface/injector';
-export {ΔdefineInjectable, defineInjectable, ΔdefineInjector, InjectableType, InjectorType} from './interface/defs';
+export {ΔdefineInjectable, defineInjectable, ɵɵdefineInjectable, ΔdefineInjector, InjectableType, InjectorType} from './interface/defs';
 export {forwardRef, resolveForwardRef, ForwardRefFn} from './forward_ref';
 export {Injectable, InjectableDecorator, InjectableProvider} from './injectable';
 export {Injector} from './injector';
-export {Δinject, inject, INJECTOR} from './injector_compatibility';
+export {Δinject, inject, ɵɵinject, INJECTOR} from './injector_compatibility';
 export {ReflectiveInjector} from './reflective_injector';
 export {StaticProvider, ValueProvider, ConstructorSansProvider, ExistingProvider, FactoryProvider, Provider, TypeProvider, ClassProvider} from './interface/provider';
 export {ResolvedReflectiveFactory, ResolvedReflectiveProvider} from './reflective_provider';
diff --git a/packages/core/src/di/injector_compatibility.ts b/packages/core/src/di/injector_compatibility.ts
index 1b1b291738..10eb13f290 100644
--- a/packages/core/src/di/injector_compatibility.ts
+++ b/packages/core/src/di/injector_compatibility.ts
@@ -139,6 +139,12 @@ export function Δinject<T>(token: Type<T>| InjectionToken<T>, flags = InjectFla
  */
 export const inject = Δinject;
 
+/**
+ * @deprecated delete by v8, use `inject`.
+ * @codeGenApi
+ */
+export const ɵɵinject = Δinject;
+
 /**
  * Injects `root` tokens in limp mode.
  *
diff --git a/packages/core/src/di/interface/defs.ts b/packages/core/src/di/interface/defs.ts
index d58957090a..041e599e08 100644
--- a/packages/core/src/di/interface/defs.ts
+++ b/packages/core/src/di/interface/defs.ts
@@ -147,6 +147,13 @@ export function ΔdefineInjectable<T>(opts: {
  */
 export const defineInjectable = ΔdefineInjectable;
 
+/**
+ * @deprecated delete before v8. Use `defineInjectable`, which is also deprecated, but will be
+ * around until v10.
+ * @publicApi
+ */
+export const ɵɵdefineInjectable = ΔdefineInjectable;
+
 /**
  * Construct an `InjectorDef` which configures an injector.
  *