Arsenal defender Bacary Sagna will spend three weeks on the sidelines due to a hamstring injury he suffered in midweek.

Manager Arsene Wenger has confirmed that the Frenchman picked up the problem while playing in the Gunners' 2-0 victory over Napoli in the Champions League on Tuesday.

Wenger said in this morning's news conference: "Sagna will be not be available, he has a hamstring injury and will be out for three weeks."

Carl Jenkinson is expected to come into the fold for this Sunday's Premier League encounter against West Bromwich Albion.