Manchester United have confirmed that Alejandro Garnacho damaged ankle ligaments during Sunday's goalless draw with Southampton.
Garnacho, 18, limped off against Southampton following a challenge from defender Kyle Walker-Peters which left him needing treatment.
Garnacho will miss United's upcoming games against Real Betis and Fulham in the Europa League and FA Cup respectively, and will also not link up with the Argentina squad during the international break later this month.
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United now know that Garnacho damaged ligaments in the collision but a timescale for the youngster's return remains unclear.
Taking to Instagram on Tuesday, Garnacho wrote: "It is difficult to put into words how I’m feeling right now.
"Unfortunately I will not be able to help my team and team mates in the upcoming games in what is a very important part of the season for us at Manchester United.
"I am disappointed to also miss the opportunity to be with my team mates of the Argentinian National Team in what would have been a great and proud moment for me and my family.
"This is part of football and our profession, however, I am already focused in my recovery. God has taught me to never give up and I will make sure I am back stronger than ever!"
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