Carlton Palmer has said Derby County will face a ‘big problem’ if they sign one of their transfer targets this summer. Derby are gearing up for a busy summer, as while 12 players see their contracts expire at Pride Park, Paul Warne has several additions to make to his squad to equip themselves for the Championship. Warne sought to bolster his side by permanently acquiring loan hero Ebou Adams from Cardiff City, although the Rams saw their £250,000 bid rejected by the Bluebirds. It appears the priority for Derby is to improve their midfield and attack as they scored the joint fewest number of g…