Borussia Dortmund's Mats Hummels will be battling to be fit for the Champions League final against Bayern Munich after limping off in the 2-1 Bundesliga defeat to Hoffenheim in the season finale on Saturday.
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"For the Champions League final there are concerns about Hummels," Klopp told reporters.
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Dortmund, European champions in 1997, take on rivals Bayern in the first all-German final of the competition in London's Wembley stadium on May 25.
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They are already racing to get offensive midfielder Mario Goetze fit in time for the game with the player recovering from a muscle injury picked up in their semifinal second leg against Real Madrid.