The teenage midfielder was taken off five minutes into the second half of the 2-2 draw at the Reebok Stadium on Tuesday night.
"Will tweaked his groin a little bit," said Rams boss Nigel Clough.
"It might be as a result of the kick he got on Saturday at Millwall. He was sore in the groin and his pelvis was a bit out of synch as well.
"We need to get him sorted out and, hopefully, get him back out there."