Paul Warne has revealed that Derby County have suffered yet another injury problem. Derby County were left worried during the first half of their win over Charlton Athletic, with Nathaniel Mendez-Laing forced off after picking up a foot injury prior to scoring the only goal of the game. The winger was replaced by Tom Barkhuizen shortly before half-time, while Paul Warne has since expressed his concern over the possibility of Mendez-Laing breaking his foot. With the 31-year-old joining the likes of Tyreece John-Jules and Martyn Waghorn on the sidelines, Derby County could now have another injur…