Stoke signing Shawcross: I rejected new Man Utd contract offer
"My contract there was up in the summer and Sir Alex wanted me to stay," he told Stoke's official website. "He offered me a new deal but the attraction of playing first-team football every week here was what swayed my decision.
"It was very hard to leave, though, as they made me a very good offer.
"Sir Alex was disappointed when I turned it down, but told me that if I was going to go to one club, it should be Stoke."