Andre Schurrle may miss Wolfsburg's Bundesliga opener against Eintracht Frankfurt on Sunday as he struggles with injuries to both thighs.
The Germany international will be expected to play a key role for Wolfsburg in his first full season back in his homeland after the 24-year-old's move from Chelsea.
But with speculation over Kevin De Bruyne joining Manchester City continuing, 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 said.
Wolfsburg sporting director Klaus Allofs tried to remain positive: "We must not dramatise; I hope that it's nothing worse."
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