Yahoo Sports reports: Germany's 18-year-old midfielder Lennart Karl may miss the World Cup after he was sent to the hospital for scans following an unspecified injury in training on Friday. Karl is considered one of the top young players in any World Cup squad after a breakout season with Bayern Munich, for which he became the club's youngest ever goal-scorer in the Champions League. World Cup rules allow Nagelsmann to call up a replacement player in cases of “serious injury or illness” until 24 hours before the kickoff of Germany's opening game.