Manchester United say Marcus Rashford will undergo shoulder surgery "imminently" to help resolve a long-standing issue.
The England attacker will be sidelined for up to 12 weeks after going under the knife, ruling him out of two months of the new campaign.
"Obviously I am not performing at my best and what I know I can perform to," the 24-year-old said of his shoulder problem earlier this month.
"Whatever that is down to, it doesn't really matter because it has been going on since early on in the season. I managed to get through the season with United.
"I think I had 36 goal involvements, so I can't look back at the year and say 'mmm, I should have taken time off to do this and do that'. That's just not the way I look at things. I just want to be available for every game."
Rashford was restricted to five appearances from the bench at the recent European Championships and he's now opted to have surgery.
"Following consultation between Marcus, the manager, club medical staff and specialists, Marcus will undergo surgery imminently to resolve his shoulder injury," United have announced in a statement.
"He will now focus on his rehabilitation in order to return as soon as possible."