McNeill scored twice on his U18 debut to help steer United a 4-0 win over Derby County.
And he showed his devastating finishing ability in a 4-3 win over Liverpool, controlling a Noam Emeran cross with one touch before driving a shot into the bottom left corner.
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He will no doubt be targeting a place in United’s first team before too long, with Greenwood having enjoyed a breakthrough season last term while still a teenager.
Solskjaer’s side are second in the Premier League after their 1-0 win over Wolves on Tuesday night. The Red Devils are just two points behind leaders Liverpool, who are away to Newcastle United on Wednesday night.