Arsenal have confirmed Kieran Tierney suffered a dislocated shoulder during Monday’s win at West Ham which could sideline the defender for three months.
Tierney started the match at the London Stadium but was forced off just before the half hour mark after landing awkwardly.
He was replaced with Sead Kolasinac as the Gunners came from behind to win 3-1 to secure their first victory since the sacking of head coach Unai Emery.
This injury is another blow for the Scotland international, who has struggled with his fitness since completing a £25million summer move from Celtic.
A hip problem meant he did not make his Gunners debut until late September, and this latest setback is expected to rule him out for a large chunk of the campaign.
In total, Tierney has been restricted to making only 11 appearances for the north Londoners.
He is one of several players missing for Freddie Ljungberg’s side as they prepare for Thursday’s Europa League trip to Standard Liege.
Nicolas Pepe and Hector Bellerin will also miss the visit to Belgium with knee and hamstring injuries respectively, while Granit Xhaka will be absent after being taken off against the Hammers with concussion.
It was a first win in three attempts for Ljungberg since he was named Arsenal’s interim manager, having drawn with Norwich and lost to Brighton, and the Swede revealed his half-time message to his players as they trailed the Hammers 1-0.
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He told talkSPORT: “For me, it was that they needed to keep their belief. It’s up to the players on that pitch.
“The main thing we talked about was to speed up the game. The passes were too slow, the movement was too slow.
“Believe in yourselves, speed things up and slice them up a bit more when you go in-behind and not be so nervous.
“Your confidence is low when you don’t win, things go a bit slower. They did it, I didn’t – the players did tremendously well in the second-half, I’m so proud.”