Chelsea 0-1 West Ham: Frank Lampard says loss is a 'reality check'

Chelsea manager Frank Lampard says the 1-0 defeat by West Ham is a "reality check" to the difficulties of winning in the Premier League when not playing at your best.

MATCH REPORT: Chelsea 0-1 West Ham

Watch highlights of all of Saturday's Premier League fixtures on Match of the Day at 22:20 GMT on BBC One and BBC iPlayer.