A Tammy Abraham hat-trick earned Chelsea victory over Luton Town in the FA Cup fourth round to relieve some pressure on manager Frank Lampard.

Abraham slotted in from Timo Werner's cut-back before nodding in a second from Reece James' chip.

Jordan Clark scored for the visitors - after an error by keeper Kepa Arrizabalaga- on 30 minutes to keep them in the game.

But Abraham poked home to seal victory before Timo Werner missed a penalty.

Chelsea will face Championship side Barnsley in the fifth round.