Karl was included in head coach Julian Nagelsmann's final 26-man squad on the back of an outstanding breakout campaign for Bayern, in which he contributed five goals and as many assists in 26 Bundesliga appearances.
The 18-year-old flew with the squad to Chicago on Wednesday, but was taken to hospital on Friday after sustaining an injury in training as the team geared up for their final warm-up game for the tournament, a friendly against the USA on Saturday.
Watch: The best of Lennart Karl in 2025/26
