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The Times claim United's hierarchy had to speak to the 19-year-old after 'several instances of lateness.'
Greenwood didn't feature in Saturday's 4-1 win over Newcastle or Tuesday's 2-1 triumph over Paris Saint-Germain, but manager Ole Gunnar Solskjaer insisted that was down to fitness.
Solskjaer stated prior to the PSG game per talkSPORT: "I can't declare medical stuff, can I?"
"It's just a niggle and, as young as he is, we don't want to take any chances with him.
"Hopefully at the weekend he'll be fine again."
He burst onto the scene last season and scored 17 goals in all competitions as United finished third in the Premier League.
But he's had a tough time this season and saw himself dropped from Gareth Southgate's England squad alongside Phil Foden last month.
The pair broke coronavirus protocol and were sent home from international duty, while not being called up earlier this month.
On the pitch, another academy star shone for United in Paris in the form of Axel Tuanzebe.
The 22-year-old made his first start in 10 months and went on to dominate Kylian Mbappe throughout the game.
It wasn't just Tuanzebe's performance on the pitch that grabbed people's attention. After the full-time whistle, the centre-back gave an incredibly composed and mature post-match interview in front of the cameras.
"For us, we came here to win," he said.
"We are in this competition to compete. We showed PSG respect but ultimately, we are the bigger team and we want to dominate and get the three points."
Solskjaer also addressed Tuanzebe's performance when discussing the win.
It's a different feeling from the last time we won here, it's at the start of the group stage but we've beaten a fantastic team," Solskjaer explained per Sport Review.
"Last time it was a knockout and it was euphoric, this is sterile without the fans but it's still excellent and we deserved to win.
"When you go away to a team like this against Neymar and Mbappe you have to defend well and your keeper will have to make saves.
"Axel Tuanzebe is a top defender and his first game in 10 months was testament to the quality he has."
Featured Image Credit: PA Images & Manchester United/Twitter
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