Brighton have no new injury concerns and could name the same team that defeated Swansea last weekend.
Midfielder Jiri Skalak has overcome an ankle problem, leaving Steve Sidwell as the only absentee.
Jack Wilshere is a doubt for Arsenal after missing Thursday's defeat by Manchester City with an ankle injury.
Nacho Monreal and Alexandre Lacazette are out as manager Arsene Wenger considers changes ahead of the Europa League trip to AC Milan.
Arsenal manager Arsene Wenger after Thursday's 3-0 defeat by Manchester City: "We're going through a difficult period...when your confidence is not at the best, the first thing that goes is your fluidity in the movement, the spontaneous side of the game.
"You look at the score and the temptation is to think it was all rubbish, but that is not the case.
"You have to take a perspective, sit back, look at the whole picture and analyse where we were poor and where we were strong.
"Part of being fair sometimes is to say 'look, that's a strong side and they are better than everybody else at the moment in the league'."
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ruthie
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