According to the sport1 website, Effenberg talked about Bayern youngster Karl in his column.

Effenberg said: "If Karl can continue his current development momentum, I firmly believe that he is fully qualified to represent the German team in the 2026 World Cup. Karl has the potential to become a 'player that changes the game'. Even if his playing time is limited, he can have a key impact on the game - Such players are currently rare in Germany. "

" (Germany coach) Nagelsmann has emphasized many times that he only recruits players who can enter the main lineup and perform well at the club, but for young players with great potential like Karl, Nagelsmann should re-examine this principle. Now is the time for young players like Karl to put on the jersey of the German team and participate in the experience of major events. Judging from Karl's current competitive state, this is a logical thing. Karl plays for Bayern, where he can train with world-class players every day and gain more practical experience in the Champions League. "