On-loan goalkeeper Frank Fielding is unlikely to remain at Derby until the end of the season.
The 22-year-old has enjoyed two separate spells at Pride Park this season, but emergency-loan rules state that he cannot remain with the Rams beyond 93 days unless there are extenuating circumstances.
"We can keep Frank in extenuating circumstances and extend his loan beyond the 93 days but we have a 24-hour recall on Stephen Bywater, as Hull have on (Matt) Duke," said manager Nigel Clough. "But, as it stands, Duke will play the last eight games."
Clough, meanwhile, expressed his desire to sign Fielding on a permanent basis.
"It was important to get Frank in for these games obviously with a view to trying to secure a deal in the summer on a permanent basis," added Clough.
"Frank is a good young goalkeeper, the England Under-21 keeper, and we think he fits into everything we are trying to do."
Copyright (c) PA Sport 2009, All Rights Reserved.