Manchester United say that Mason Greenwood will not train or play matches until further notice after being accused of assault.
The allegations, which included video, photographs and a voice note, were released on Sunday morning.
They have been deleted.
Manchester United does not condone violence of any kind.
Manchester United said in a statement that they are aware of images and allegations on social media. We won't make any more comments until the facts are established.
Manchester United doesn't condone violence of any kind.
Mason will not return to training or play matches until further notice, Manchester United said in a later statement.
In his first year at the club, he has made over 100 appearances.
Greater Manchester Police was aware of images and videos on social media.
Enquiries are ongoing to establish the full circumstances.
The person contacted Greenwood for a comment.