Manchester United staff members have been concerned about Marcus Rashford for some time.
The attacker has built up a reputation for having a party lifestyle, which has impacted his on-field performances.
Per The Sun, Rashford calling in sick for training after partying all night is not a surprise to some at United.
They were worried about his nights out as early as 2021, according to the source.
Former United star Wayne Rooney even decided to get in touch with Rashford, given his own issues with drink earlier in his career.
Rashford is likely to be back in the United team when they take on Wolves in the Premier League on Thursday.