Koscielny an injury doubt for Bayern clash
Arsenal will check on the fitness of defender Laurent Koscielny (calf) ahead of the Champions League last 16 clash against Bayern Munich.
Left-back Nacho Monreal, signed from Malaga, is ineligible, but Carl Jenkinson comes back into the squad after a one-game suspension.
Defender Kieran Gibbs remains out with a thigh injury.
Bayern Munich's Jerome Boateng will miss the game after being sent off in his club's previous Champions League tie.
The former Manchester City man serves a suspension, but the versatile Javi Martinez has been included in Bayern's 19-man squad after recovering from a bruised toe.
Holger Badstuber is missing as he continues his recovery from a cruciate ligament injury and ex-Chelsea striker Claudio Pizarro is also unavailable for last season's runners-up
Arsenal (from): Szczesny, Vermaelen, Koscielny, Mertesacker, Sagna, Podolski, Arteta, Cazorla, Wilshere, Walcott, Giroud, Mannone, Coquelin, Ramsey, Diaby, Rosicky, Oxlade-Chamberlain, Gervinho, Miquel.