Now the teenager is fast becoming a household name with the youngster finding the net 17 times in all competitions so far.
And former United defender O’Shea praised the youngster, believing his fine form has saved Solskjaer millions so far – and will continue to do so.
“When you look at Man City losing last night and the money they threw at teams and bringing in players, they’ve had the success of winning a few leagues recently, but they got caught in Europe, in the League of Nations. champions. », He told RTE.
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And Lyon hotshot Moussa Dembele is another who has been linked.
But while O’Shea believes Greenwood is a raw talent, he also believes United don’t need another hitman at the top.
He said in July: “There is still a long way to go before he gets up. [standard of Wayne] Rooney, ou [Ruud] van Nistelrooy or Solskjaer. But he is on the right track.
“Look, if he can maintain that and make sure that by the time Ole picks him into the squad, he might change his mind on transfer goals as well.
“If you call in an attacker, have you upset the balance right now with the three [Anthony] Martial, [Marcus] Rashford et Greenwood? »
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United star Bruno Fernandes was recently asked about Greenwood.
And the Portugal international insisted the best was yet to come, saying: “I think Mason has had a great season, of course.
“He’s young and he’s got some great numbers this season.
“Age is just a number, and you can see Mason has done very well. He can do a lot more thanks to his qualities and he still has to grow physically.
“He has done fantastic this season and he will get better.
“He needs to play more and get more confidence from his teammates and staff and I think he will do a lot better because he has that quality.