Henrikh Mkhitaryan and David Ospina are injury doubts for Arsenal ahead of Atletico Madrid second leg match.
Ospina will most likely be unavailable because of rib injury which will mean a recall in goal for Petr Cech who has lost his place as the Gunners' No.1 in recent times. Cech was forced to watch Arsenal's defeat at Old Trafford over the weekend from the bench.
Mkhitaryan also suffered knock to his injured knee during Manchester United match. However decisions will be made on the pair closer to kick off.