United manager David Moyes confirmed the news in a pre-match press conference Friday, ahead of the Red Devils' FA Cup third-round tie with Swansea.
Moyes said that the injury was picked up in a collision with Hugo Lloris during the 2-1 defeat to Tottenham on New Year's Day.
Ashley Young (@Youngy18) will miss Sunday's game vs Swansea with a shoulder injury following a challenge by Spurs goalkeeper Hugo Lloris.— Manchester United (@ManUtd) January 3, 2014
The injury continues Moyes' headache over a challenge which he claimed should have seen a penalty given to his side, as reported by Sky Sports.
Following the game, Moyes said:
It was scandalous, a scandal.
If you follow through on a player anywhere else on the pitch with your foot high, it would be a sending-off and a red card. You couldn't do that anywhere else.
Although it is confirmed that Young will miss the game against Swansea at Old Trafford, Moyes claimed he did not know how long the injury would keep the winger out for in total, as per Chris Wheeler of the Daily Mail Online.
David Moyes says Ashley Young's shoulder injury is expected to "keep him out for a time... we're not sure exactly how long yet." #mufc— Manchester United (@ManUtd) January 3, 2014
We have a few injuries, one of which was because of the goalkeeper's challenge and is going to keep Ashley Young out for a time.
He's got an injury he received from the challenge, its a shoulder injury, we're not sure exactly how long he will be out.
United travel to Sunderland in the Capital One Cup semi-final first leg Tuesday before hosting Swansea in the Premier League Saturday, Jan. 11.
It is likely that 18-year-old Adnan Januzaj, Nani and Shinji Kagawa will benefit most from Young's absence.
Teenager Januzaj has impressed during his breakthrough campaign for the Red Devils. He has scored three goals, assisted a further two and earned a nomination for the BBC Young Sports Personality of the Year 2013, but he ultimately failed to make the top three, as reported by The Independent's Marc Williams.
However, he has courted controversy, too. Januzaj is the second most booked player for simulation in Premier League history after receiving a third caution for the offence during the game against Tottenham, per Joe Strange of the Daily Mail Online.