Stewart Robson claims Jack Wilshere may have to leave Arsenal if he’s to fulfil his potential. The England star, who has struggled with injuries this season, came in for criticism from ex-Man United midfielder Paul Scholes on Tuesday night, following the Gunners 2-2 draw with Swansea. Scholes claimed that Wilshere had not improved since the age of 17, and former Arsenal star Robson claims Arsene Wenger is firmly to blame for the 22-year-old’s lack of development. “Jack Wilshere can be a world class player,” he told talkSPORT. “I’ve seen him from a young boy and he’s an outstanding footballer. “Paul Scholes is right though, he hasn’t developed as well as everybody would have liked him to. “He lacks discipline. He wants to get on the ball and charge into tackles, there seems to be no discipline. “Who does that come from? The manager. Wenger has to make sure he has a role in the side where he knows what to do when he does, and doesn’t, have the ball. “He can be petulant at times. Why is he petulant? Because the manager is petulant on the sidelines and it’s never been sorted out.