Derby face an anxious wait to discover if striker James Vaughan can continue his loan spell at the club.
The 21-year-old is due to stay with the Rams until January but missed Saturday's home win over Sheffield Wednesday with a knee injury and has returned to Everton to have the problem assessed.
"He didn't start against Cardiff on Tuesday night because of a bit of swelling on his knee and it has not settled as quickly as we had hoped," said County coach Gary Crosby. "James has gone back to Everton to see the consultant who has been looking after him and we are waiting for the results. We will just have to wait and see."
Vaughan, who has suffered with knee problems in the past, joins a long list of injured Derby players that includes Dean Leacock, Paul Connolly, Miles Addison, Jake Buxton, Paul Green, Stephen Pearson, Steve Davies, Kris Commons, Chris Porter, Giles Barnes, Mitch Hanson and Mark O'Brien.
Meanwhile, young left-back Mark Dudley has joined non-league neighbours Alfreton Town on a month's loan.
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