After being left on the bench for Bayern's win against Augsburg at the end of August, German legend Lothar Matthaus said he saw the teenager looking upset and frustrated as the former star criticised coach Vincent Kompany for his reluctance to trust the academy's top performers.
Bayern striker Harry Kane, however, urged Karl to stay patient and keep working hard, saying: “If I were him, I would train hard, work hard, and try to learn from the people around me. When he gets his chance, he has to take it, just as he has done so far.”