Knight: Debut strike

90 + 4 - ALL OVER: Villa secure a classic smash and grab victory and Chelsea's bad news continues as Drogba is carried off injured.

88 - GOAL!! Young breaks down the left and fires a shoot towards the goal, which Agbonlahor deflects in.

86 - Villa relief: The home side earn a corner as they try to catch their breath, but they look like they might hang on for the win.

83 - Effort goes wide: Kalou drags a good chance wide, but it is the closest Chelsea have come to an equaliser despite dominating possession.

79 - Substitution: Stiliyan Petrov replaces Carew as Villa switch to a five-man midfield.

75 - Hanging on: Villa are being forced to constantly defend, but Chelsea are struggling to test Scott Carson in the home goal.

71 - Booking: Carew goes in the book for clattering Michael Essien and Agbonlahor also collects a booking for contesting the decision.

70 - Booking: Drogba is booked for dissent as Chelsea's frustrations begin to increase.

66 - Booking: Barry receives a yellow card for swinging out at Joe Cole.

65 - Under pressure: Villa are struggling to get out of their half as Chelseas chase an equaliser.

64 - Close chance: Terry heads over from a corner.

63 - Substitution: Jose Mourinho produces his trademark positive changes as Joe Cole and Salomon Kalou replace Wright-Phillips and Claude Makelele.

61 - Terrific challenge: Slick Chelsea build up is thwarted when Reo-Coker arrives just as Malouda is about to pull the trigger.

58 - Great skill: Drogba embarrasses Laursen with a deft flick, but Knight shepherds the ball out for a corner.

56 - Booking: Nigel Reo-Coker receives a yellow card for a late challenge on Florent Malouda.

55 - Drogba dramatics: The striker seems to go down softly under the challenge of Knight to win a dangerous free-kick, but it is wasted.

53 - Substitution: Pizarro replaces John Obi Mikel

47 - GOAL!! Zat Knight heads home a Barry corner to mark his debut in style.

46 - We're back: Chelsea kick-off the second half as heavy rain begins to fall.

45 + 1 - HALF-TIME: The first 45 minutes ends with honours even.

45 - Near miss: Young supplies a good ball into the Chelsea area, but Moore and Gareth Barry get in each other's way to waste the chance.

42 - Villa chance: Martin Laursen steers a difficult header over the bar.

40 - Chelsea dominance: The Blues are ending the half on top and are looking dangerous from crosses.

38 - Ambitious attempt: Wright-Phillips looks to burst past Olof Mellberg and fires over the bar when under pressure.

34 - Header: Alex meets a Chelsea corner and heads narrowly over.

33 Chelsea chance: Wright-Phillips has a chance to cross to the waiting Drogba, but the winger wastes the opportunity.

28 - Carew pressure: John Carew is proving a handful for the Chelsea defence, but shots on target are at a premium.

25 - High tempo: The game is being played in an end to end style.

20 - Wright-Phillips confident: Shaun Wright-Phillips is looking to continue his good form, but wastes a good chance when team-mates are well placed.

18 - Wasted chance: Didier Drogba drags blasts over from the edge of the box.

14 - Villa chance: Gabriel Agbonlahor pounces on a Terry clearance, but fires his effort straight at Cech.

12 - Header: John Terry goes close with a headed chance from a corner.

7 - Clever turn: Luke Moore shows neat footwork to produce a good save from Petr Cech.

3 - Good effort: Florent Malouda fires an effort just wide.

Kick- off: Villa get the game going.

Chelsea team news: Juliano Belletti and Rodrigo Alex start after missing out against Portsmouth, while Claudio Pizarro drops to the bench.

Team news in: Ashley Young and Zat Knight start for Villa after missing out in their last Premier League game.