The former United star told The Metro: "I like Zirkzee – he was unfortunate to get injured when he did, but he’s a real baller and I think he can be a superstar for Manchester United if he can get games under his belt. He needs a regular run. I don’t think he’s had a 10-game stint where he has actually played week in, week out. There were reports that he wasn’t quite fit when he signed, so it took him a bit of time to get up to speed. I think he was just finding his feet when he got injured but I think he’s going to prove a real key player next season."