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Arsenal could be without Kieran Tierney for up to three months after the defender suffered a dislocated shoulder in the win over West Ham.

The former Celtic left-back fell awkwardly and had to be withdrawn on the half hour mark during the 3-1 victory at London Stadium.

Speaking after the game, interim head coach Freddie Ljungberg said: "Tierney, I think it's something with his shoulder but I don't know exactly what it is. But obviously we had to take him off so I think he's going to maybe go to hospital and check what it is."

Further diagnosis revealed the 22-year-old has damaged his shoulder, and a spell of up to three months on the sidelines is expected for the Scottish international. Tierney is to continue receiving consultations on his shoulder, with an expected return date not yet clear.

The injury is a major setback for Tierney, who is still to fully establish himself at the north London club since his summer move from Celtic.

The defender had to wait til late September to make his debut due to a niggling groin problem, before suffering a further setback with his hip.

Elsewhere, Arsenal face a nervous wait to see if Nicolas Pepe and Hector Bellerin will be fit for the Premier League clash against Manchester City on Sunday.

The pair are out of the Gunners' Europa League game against Standard Liege on Thursday, and will be assessed ahead of the visit of City.

Pepe sustained bruising to his left knee during the 3-1 win at West Ham after several heavy challenges from Hammers fullback Aaron Cresswell, while Bellerin tweaked his hamstring during the warm-up at London Stadium and had to be replaced in the line-up by Ainsley Maitland-Niles.

Granit Xhaka will also definitely miss both upcoming games after the former captain was struck in the head during the West Ham game.

A club statement said: '[Xhaka]Will miss Standard Liege (a) and Man City (h) and will be managed as per concussion protocols.'