Arsenal travel to the Nou Camp to face European champions Barcelona and face the daunting task of overturning a 2-0 first leg defeat in order to qualify for the Champions League quarter-finals.
Arsenal have Laurent Koscielny back from injury for their Champions League round of 16 second-leg tie at Barcelona.
The Gunners go into the clash 2-0 down from the home leg but welcome back Koscielny – who has been missing with a calf problem.
He replaces Calum Chambers in the matchday squad, but Aaron Ramsey (thigh), Jack Wilshere (leg), Tomas Rosicky (thigh), Petr Cech (calf), Santi Cazorla and Alex Oxlade-Chamberlain (both knee) are all still missing.
Barcelona will be without Gerard Pique after he picked up a one-game ban in the dying minutes of the first leg.
Possible starting line-ups:
Barcelona: ter Stegen, Alves, Mathieu, Mascherano, Alba; Rakitic, Busquets, Iniesta; Messi, Suarez, Neymar.
Arsenal: Ospina, Bellerin, Mertesacker, Koscielny, Monreal; Coquelin, Elneny; Walcott, Ozil, Sanchez; Welbeck.