Derby County have an injury scare days before their season starts, with the defender Claude Davis to be assessed this week after he suffered a hamstring strain in the friendly match with Espanyol on Saturday.
The £3m signing from Sheffield United left the pitch after 62 minutes of the 2-2 draw.
"We will have to be very careful with him in next week's training," the Derby manager, Billy Davies, told the Rams' website. "We will see how it settles down and monitor it over the next three or four days. Hopefully we can have him right."