Derby County must get promoted to the Championship this season or risk losing one of their most valuable assets. Derby County are approaching the most pivotal part of their campaign. With six matches left, Paul Warne‘s men currently sit in second position, four points ahead of Bolton Wanderers but five adrift of leaders Portsmouth. Despite losing against Northampton Town on Saturday, the Rams are in a strong position to win promotion, but failure to do so could see them lose a few of their key players. Derby sold academy graduate Max Bird to Bristol City in January with the 23-year-old returni…