The Dutchman was stretchered off during the final moments of Wednesday's victory over Olympiakos but his international assistant boss has played down the severity of the knock
Van Persie was stretchered off late in the day against Olympiakos on Wednesday, with the 30-year-old having scored a superb hat-trick to send United through to the quarter-finals of the Champions League.
Speaking immediately after the game David Moyes confirmed the striker had taken a knock on the knee but Kluivert is confident that it is not serious and that he could still be fit to feature in the crunch meeting with title-chasing Manchester City.
He told Algemeen Dagblad: "Robin went right to the hospital on Thursday morning. His upper leg was quite stiff. We have to wait for the results, but we have high hopes that it's not a heavy injury. Maybe he can play against Manchester City next week."
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He added: "It was a wonderful match vs Olympiakos. United really had to win to save their season. If you see them start like that, with a lot of pressure going forward, it's really impressive. Really nice to see as well.
"I have a lot of contact with Robin and I like watching him play. He deserved this. He was really keen on a good match on Wednesday. A few days earlier they got trashed by Liverpool, so they needed to answer, and that's just what United did, with Van Persie starring."