Manchester United management have concerns about Mason Greenwood's off-field habits.
Greenwood did not feature in Saturday's 3-1 win at Everton, with illness cited as the reason.
The Daily Mail says there are concerns at the club over Greenwood's lifestyle, specifically the amount of sleep and rest he is getting to stay in the condition needed to perform at the highest level.
Last month it emerged that United had spoken to the 19-year-old over his time-keeping around the club.
United are said to feel that Greenwood — who also admitted to 'poor judgment' in September after a video emerged of him inhaling nitrous oxide –— needs to focus on his development as a footballer.
