Mertesacker back in Arsenal training

Per Mertersacker’s return to full training offers Arsene Wenger a timely defensive boost, with Shkodran Mustafi set to miss most of Arsenal’s festive program through injury. Gunners captain Mertesacker has not played all season due to a knee injury. Fellow German Mustafi’s arrival from Valencia has helped Arsenal discover a new-found defensive solidity this season – only Tottenham and Chelsea have conceded fewer goals than Wenger’s side.