The nature of Karl's injury has not been confirmed by either Bayern Munich or the German Football Association, though the speed of his withdrawal from the squad suggests a significant muscular problem sustained in training. He is the highest-profile casualty from Julian Nagelsmann's preparations.
Karl had an outstanding debut professional season, establishing himself in Bayern's first-team setup under Vincent Kompany with a series of impactful performances that earned universal praise both domestically and in the Champions League. His inclusion in Germany's squad was widely regarded as merited.
Eberl spoke on Bayern's official website.
"Missing a World Cup at short notice obviously hurts enormously, and the news was a shock for the whole of FC Bayern.
"But it doesn't change how much talent, passion and future Lenny has. He had more than earned this World Cup through his outstanding first professional season."
He was equally emphatic about the club's commitment to his recovery.
"Lenny will get all the support from FC Bayern to be back on the pitch as soon as possible — and we all know that he still has many great tournaments ahead of him. He is already looking forward again and says he will come back stronger. That is what I like about him, and that is the spirit you need in moments like this."
Karl is expected to return to pre-season training once his recovery is complete.