The 30-year-old French defender skippered the Gunners last term and has been chosen for the job again, ahead of potential contenders such as Cesc Fabregas.
Arsenal manager Arsene Wenger said: "If he plays, he will be captain. If he does not play, it will be somebody else. But William will be the club captain, yes."
Copyright (c) PA Sport 2008, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms