The 23-year-old striker's last appearance for the Old Trafford club came over three years ago and he is currently on loan at SPL outfit Aberdeen.
"I think I've come to terms with it," Wilson told ESPN when asked about the prospect of leaving United this summer. "I wouldn't say I'm 100 percent certain I'm going to leave. There's still a slight chance I might get a contract but I think I'm edging towards leaving in the summer.
"I'll come to terms with it more when it actually happens. I think it might be tougher than perhaps I thought. My focus is one the next step, wherever that might be."