The Premier League club initially said it did “not condone violence of any kind,” but later suspended the £75,000-a-week star as a police probe was launched.
A spokesman for the club said: “Mason Greenwood will not return to training or play matches until further notice.”
Now fellow stars have unfollowed their team mate, with striker Cristiano Ronaldo being the first after the allegations came to light.
Jesse Lingard, David De Gea, Paul Pogba, Ederson Cavani and Scott McTominay have all unfollowed Greenwood on Instagram.
Other members of the squad, including captain Harry Maguire, are still following the star.
The Club’s official Instagram and Twitter pages are still following the star, but confirmed that he was suspended from training and games until further notice.
Crime scene investigators from Greater Manchester Police were seen parked outside the footballer’s house in Bowdon, Greater Manchester, on Sunday afternoon.
Security staff, thought to have been provided by his club, were present at a second home he owns nearby and they confirmed his parents were inside.
Last night the Manchester United Supporters Trust (MUST) tweeted: “The club has now confirmed that Mason Greenwood will not return to training or play matches until further notice.
Manchester United have announced that the England star has been suspended indefinitely after the allegations surfaced online.
“MUST fully support the decision of the club in this regard.”
The images and allegations were reportedly visible on the woman’s Instagram on Sunday morning, but have since been deleted.
A spokesman for Greater Manchester Police said: “Police were made aware of online social media images and videos posted by a woman reporting incidents of physical violence.
“An investigation was launched and following enquiries we can confirm a man in his 20s has since been arrested on suspicion of rape and assault.
“He remains in custody for questioning. Enquiries are ongoing.”
Nazir Afzal, former Chief Crown Prosecutor, added: “These allegations need to be investigated quickly.”
Greenwood joined Manchester United at the age of six and progressed through the academy ranks.
He started playing for the first team in 2019, aged 17, and has made 129 appearances on the pitch for the team.
Greenwood also represented England several times as an under-17 and under-21 before being named in the England senior squad in August 2020