West Ham chief David Sullivan is being urged to make a big Mauricio Pochettino U-turn but there’s a problem. If Julen Lopetegui didn’t already feel a touch unwelcome ahead of his unveiling as West Ham boss, he will now. The Spaniard, out of work since walking out on Wolves last August, was left licking his wounds when AC Milan pulled the plug on appointing him two weeks ago. Lopetegui had reportedly been in talks with the Italian giants for six months about replacing Stefano Piolo. But a large-scale online fan protest saw Milan’s bosses withdraw a three-year contract, much to Lopetegui’s ‘shoc…