bootstraping angular4 app AppModule after a API call possible?

Question

I want to call a API before angular4 AppModule is started/initialized. is this possible?

@NgModule({
    declarations: [
        APP_COMPONENTS,
        AppComponent
    ],
    imports: [
        BrowserAnimationsModule,
        FormsModule,
    ],
    bootstrap: [AppComponent]
})
export class AppModule {
  constructor(){
    console.log('Init. Module...');
  }
}

Before the bootstrap component 'AppComponent' initialized, i want to call a API.