Derby defender Martin Albrechtsen could opt to undergo groin surgery during the international break, according to Rams manager Paul Jewell.
The 28-year-old, a free summer signing from West Brom, has been suffering with a persistent groin injury and has seen a specialist about the problem.
Albrechtsen also sustained a hamstring strain against Birmingham last week which ruled him out of Saturday's victory at Norwich. A scan revealed no tear but the problem could take another 10 days to clear up, putting the Dane's availability in doubt when the Championship programme resumes on October 18 with a home game against in-form Plymouth.
Jewell must decide whether the time is right for Albrechtsen to have a groin operation.
"Martin's hamstring is not too bad but he may well need a groin operation. We will know more this week," said Jewell.
"There is no tear in the hamstring - the scan was clear - but it will be a bit longer before he is back and he has had an ongoing groin problem. So we have got decisions to make but we can make them with a clear head."