Andy Carroll has suffered yet another injury setback at West Ham . In a double blow the luckless Irons will also be without Enner Valencia, who has been playing up front in Carroll’s absence, for Sunday’s FA Cup tie at Blackburn. Carroll, 27, only recently returned from a hamstring injury suffered last month. But he picked up a muscle problem during West Ham’s 2-2 draw at Norwich last weekend. He is expected to be back for the club’s home game against Sunderland on Saturday week. Valencia, 26, was kicked on his ankle in the Norwich game. No date has yet been specified for his return.