Arsenal take on Napoli in Champions League Group F on Tuesday night. Here, Press Association Sport takes a look at some of the key battles ahead at the Emirates Stadium:
PER MERTESACKER v GONZALO HIGUAIN
German defender Mertesacker has improved into a consistent performer alongside Laurent Koscielny at the heart of the Arsenal defence. And he will need to bring that against Argentina forward Higuain, who if things had worked out differently this summer could have been leading the Gunners' attack.
MESUT OZIL v MAREK HAMSIK
Arsenal's club-record signing Ozil has quickly started to repay his £43million transfer fee with some impressive displays as the main conduit for the Gunners' frontline. However, in Slovakian playmaker Hamsik, Napoli also have their own marquee player more than capable of unpicking the most stubborn of defences anywhere in Europe.
OLIVIER GIROUD v RAUL ALBIOL
France forward Giroud has grown in stature this season, with five goals at the spearhead of the Arsenal attack. Spain defender Albiol will be out to nullify Giroud's threat - and dampen his 27th birthday celebrations with a shutout at the Emirates Stadium.