Laurent Koscielny and Alex Iwobi have both been named in the Arsenal starting lineup for tonight's Champions League clash away at Barcelona.

French defender Koscielny has been sidelined since February 28 with a calf complaint.

However, he has made a full recovery to come into the defence at the expense of Per Mertesacker.

There is also a surprise start for youngster Iwobi in a wide role, which means that Theo Walcott and Joel Campbell have both been relegated to the bench.

Meanwhile, Danny Welbeck has been preferred to Olivier Giroud in the role of lone striker.

As for the home side, head coach Luis Enrique has turned to Jeremy Mathieu to replace the suspended Gerard Pique at the heart of the defence.

Unsurprisingly, the three-pronged attack of Lionel Messi, Luis Suarez and Neymar all start at Camp Nou.

Barcelona: Ter Stegen; Alves, Mascherano, Mathieu, Alba; Busquets, Iniesta, Rakitic; Messi, Neymar, Suarez
Subs: Bravo, Arda, Bartra, Munir, Sergi Roberto, Vidal, Vermaelen

Arsenal: Ospina; Bellerin, Koscielny, Gabriel, Monreal; Elneny, Flamini; Iwobi, Ozil, Sanchez; Welbeck
Subs: Macey, Mertesacker, Gibbs, Coquelin, Campbell, Walcott, Giroud

Follow Sports Mole's live text coverage of the encounter in Catalonia here.