Andre Schurrle could miss Wolfsburg's Bundesliga opener against Eintracht Frankfurt on Sunday as he struggles with injuries to both thighs.
The Germany international is expected to play a key role in his first full season back in his homeland after moving to the Volkswagen Arena from Chelsea during the January transfer window.
However, with Manchester City poised to launch a £45 million bid for Kevin De Bruyne, Wolfsburg also have a concern over Schurrle ahead of their home clash with Eintracht this weekend.
"I have problems in both thighs; we must see what it is," Schurrle told reporters.
Wolfsburg sporting director Klaus Allofs, meanwhile, tried to remain positive.
"We must not dramatise; I hope that it's nothing worse."
Wolfsburg finished last season as Bundesliga runners-up behind champions Bayern Munich, taking second place ahead of the likes of Borussia Monchengladbach, Bayer Leverkusen, Schalke and Borussia Dortmund.
They started the 2015-16 campaign in fine fashion, too, by beating Bayern on penalties in the DFL-Supercup.
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