Arsenal have suffered a raft of injuries ahead of their Europa League clash with Slavia Prague.
The Gunners beat Sheffield United 3-0 on Sunday - but it came at a cost.
Bukayo Saka came off injured, and he could join a packed treatment room at the Emirates.
Speaking after the game Gunners boss Mikel Arteta confirmed left-back Kieran Tierney is 'probably out for the season' while David Luiz will also miss the Slavia game.
He added: "Emile [Smith Rowe] and Martin [Odegaard], we don't know yet.
"Bukayo [Saka], we'll see how he develops in the next few days.
"He had discomfort in his thigh and it's the last thing we need because we are missing some big players at the moment."
Captain Pierre-Emerick Aubameyang also missed the game at Bramall Lane with a cold, but is expected to return to face Slavia Prague.