Striker Billy Clarke is a doubt for Saturday's home game with Leeds United. The frontman has aggravated the ankle injury he picked up in the 3-1 derby victory over Norwich City.
Town's head of sports science Dave Williams told the club site: "Billy took another knock on the ankle at Cardiff.
"It's aggravated the injury and he's had a scan. It's confirmed that he is suffering with bone bruising.
"It's sore and he has sat out training so far and we'll have another look at it later in the week.
"It's nothing serious, but obviously at this stage he is a concern for the weekend."
Better news is that Alan Lee is back in full training after his recent groin injury. Town's top scorer is available for Saturday's game having served a one-match ban last weekend after reaching five bookings.