How extensive is his injury?
Rashford has been dealing with a muscle tear in his left shoulder since November, the problem limiting movement and causing discomfort.
Painkiller injections were used to help her continue to play. The problem is not expected to worsen, but Rashford would like to have the corrective procedure to regain full form for the coming campaign.
How did Rashford fare in the Euros?
Rashford made five appearances during the Euros, all as substitutes.
The 23-year-old has never played more than 25 minutes per game, with his shortest time on the pitch having lasted a minute in extra time before a penalty shoot-out against Italy in the final.
Rashford took the third penalty which hit the post. Since then, he has received numerous racist insults for not having scored his kick.
Which league games is Rashford likely to miss?
Manchester United begin their 2021-22 campaign at home against Leeds on August 14 before heading south to face Southampton on August 21.
Rashford may not have an operation until the end of July, which could take his recovery period until the end of October. By mid-October, United will have made eight Premier League appearances, including games against Everton, Leicester City and West Ham.
They host Liverpool at Old Trafford on October 23, followed by games against Tottenham Hotspur and Manchester City.