Derby County can’t afford to let one of their star players depart this summer as Paul Warne faces a contract dilemma. Derby County are on the brink of securing promotion back to the Championship after two seasons in League One. The Rams are four points away from guaranteeing their place in the second tier, and it could be confirmed this weekend if Derby beat Cambridge and Bolton drop points at home to Port Vale. With the season ending in 10 days, Paul Warne has to resolve the futures of his first-team squad as several of his players see their contracts expire in June. As it stands, 12 players …