Arsenal welcome midfielder Aaron Ramsey back into the squad for their crucial Champions League clash with Dinamo Zagreb.

The Wales international has been out for five weeks with a hamstring problem but returns at a perfect time for Arsene Wenger.

Fellow midfielders Mikel Arteta (calf) and Francis Coquelin (knee) are absent, as are Theo Walcott (calf), Alex Oxlade-Chamberlain (hamstring), Jack Wilshere (leg), Danny Welbeck and Tomas Rosicky (both knee).

Provisional squad: Cech, Ospina, Monreal, Gibbs, Debuchy, Chambers, Koscielny, Gabriel, Mertesacker, Ramsey, Flamini, Cazorla, Ozil, Reine-Adelaide, Iwobi, Sanchez, Campbell, Giroud.