Thanks to everyone who participated.
I just found the solution to my problem in another thread. HERE
This is what I did.
if(Request::is('admin/*')) {
$my_route = str_replace(URL::to('admin'),"",Request::url());
$request = Request::create($my_route);
return Route::dispatch($request)->getContent();
}
I could not find these methods in the documentation. So I hope, this will help others too.