Missing Players and team news:
Olympiacos are in somewhat of a defensive crisis with centre-backs Ruben Semedo and Avraam Papadopoulos out injured, and Ousseynou Ba was taken off after just 18 minutes against Lamia, leaving Martins with a big call to make at the back. Former Arsenal man Sokratis has also been nursing a shoulder problem but is expected to be fit for this game, so either Yann M’Vila or Mohamed Drager appear to be the most likely options to fill in at the heart of defence. Mady Camara was suspended for the weekend’s victory but will return to the engine room this week, while Hassan’s crucial goal in the second leg against PSV is unlikely to earn him a start over Arsenal’s public enemy number one El Arabi. As for Arsenal, Emile Smith Rowe’s hip problem is not a significant one, but it was enough to keep him out of the draw at Burnley and he remains a major doubt for this game. The Gunners are in good shape otherwise, and while he somehow failed to find the back of the net at Turf Moor, Pepe will hope to be handed a start in this fixture over Willian. Cedric Soares was rested entirely at the weekend so could be given the nod at right-back here, while Gabriel Magalhaes could displace Pablo Mari at the back, although the Spaniard has been solid in recent matches.