Arsenal nearly extend their lead, but Cech blocks a Denilson shot and gathers the ball in his arms.

The fourth official has indicated that there will be four minutes of added time.

Chelsea need someone to produce something special in the remaining few minutes - can they do it?

Malouda attempts to volley the ball in the net from distance, but it goes miles wide and he never looked like scoring.

Fabregas wastes the resulting free kick though as his effort goes comfortably into the arms of Cech.

Should Arsenal manage to hold onto this lead, it will mean that Chelsea's lead over them is cut to seven points.

Deco hits a shot first time from outside the area, but yet again, it fails to test Almunia. Chelsea are running out of time here.

Lampard looks to thread a ball into the path of Anelka, but Sagna does superbly well to win the ball.

Malouda tries his luck from a long-range free kick but it goes comfortably over the bar and fails to test Almunia.

Arsenal are playing some great stuff now and only an excellent Terry challenge prevents Fabregas getting a shot away after a neat passing move.

Adebayor takes it past Ivanovic and finds Denilson on the right wing, but the midfielder's cross is poor and the attack breaks down.

Even though Chelsea have only lost one Premier League game at home in 89 matches, they have only won three times at Stamford Bridge in the league this season.

Deco wins the ball for his side and plays an early ball forward looking for Anelka, but Gallas stands firm to prevent any chance of a shot at goal.

Ashley Cole latches onto a short pass from Anelka, but his low shot doesn't test Almunia in the Arsenal goal.

The resulting free kick is taken by van Persie and although it goes past the wall, it also goes wide of the goal.

Gael Clichy makes a superb run forward down the left wing and is only stopped when Branislav Ivanovic stands in his way. Free kick to Arsenal.

Chelsea then push forward and the ball eventually falls to Lampard who watches on as his deflected effort goes wide of the post.

Fabregas leads another Arsenal attack, but his floated ball into the penalty area is dealt with by Terry.

This game is all set up for a fantastic finish now and you get the feeling that there are more goals to come.

What an amazing turnaround - how can Chelsea respond to this?

Arsenal are on top now and growing in confidence as van Persie's shot is blocked well by Ashley Cole.

Chelsea attack again through Anelka and his sqaure pass only just avades the sliding Deco.

Denilson looks to create something for his team, but his cross is way too high for any Arsenal players and Cech collects it with both hands.

Anelka finds space as Chelsea hit Arsenal on the counter attack and gets a cross into the box, but no Chelsea players are waiting in the area to get on the end of it.

Fabregas lofts the ball over the Chelsea defence towards Adebayor, but Terry uses his strength to win the ball and clear any danger.

Lampard comes close to making it 2-0 as his shot from 20 yards out goes just wide of the post - he should have hit the target really.

Deco turns well and looks to send Anelka away, but the Chelsea striker is adjudged to have fouled Gallas and it's a free kick to Chelsea.

Deco and Ashley Cole combine well on the left flank before the latter's cross is deflected behind by Djourou.

A win for Chelsea today would put plenty of pressure on Liverpool who take on West Ham tomorrow night.

Ashley Cole gets a cross in from the left hand side, but Gallas is there to hack the ball away.

Samir Nasri skips past Mikel before threading a ball through to van Persie, but Adebayor is ruled offside. That's frustrating.

If Arsenal do manage to get themselves back into this game, they will be the first team to have scored agaisnt Chelsea in the second half this season.

There are no changes for either side - it is a case of 'as you were' at the beginning of the second half.

Terry fires a long ball forward from defence, but it doesn't find a Chelsea player and Arsenal are able to build an attack.

Deco looks to push forward for his team down the right hand side, but he runs out of space and is forced to concede a throw in.

Arsene Wenger would love it if his team could grab an equaliser before the break, it would make his team talk so much easier.

Deco plays another excellent ball over the top of the Arsenal defence, but Anelka is in an offside position and the move breaks down.

Fabregas picks up the loose ball and tries his luck from distance, but Cech holds onto it with relative ease. Not the most powerful effort.

Lampard plays a fantastic ball through to Kalou, but the striker fouls his man and is unable to get a shot on goal.

Chelsea have kept 14 clean sheets in the last 21 Premier League games. Another one today and it's three points for Scolari's men.

After a scramble in the Chelsea penalty area, the ball falls to van Persie who forces a decent save from Cech.

Sagna makes a crucial challenge on Kalou just as he was about to fire a shot towards goal. Superb defending.

This is a real test of Arsenal's ability now - can they come from behind to grab themselves a priceless win?

Bosingwa's cross was very difficult to deal with and there wasn't a lot Djourou could have done about that.

Corner for Chelsea taken by Lampard is easily claimed by Almunia.

Free kick on the edge of the penalty area for Chelsea is taken by Ballack, but deflects off an Arsenal player before being cleared away. Poor effort.

Deco dinks the ball into the penalty area into the path of Lampard who finds Kalou with a lofted cross, only for the striker to produce a very weak header towards goal.

Chelsea free kick from 25 yards out is smashed straight into the wall by Lampard - that's a poor effort by his standards.

Lampard gets on the end of a Bosingwa cross, but his header goes straight into the arms of Almunia. A yard either side of the keeper and it was 1-0.

Arsenal are enjoying themselves and passing the ball around with real purpose - not bad for a club in crisis is it?

Almunia charges out of his penalty area to clear the danger after Ballack had played Anelka through on goal. Good play from the Arsenal keeper.

Adebayor attacks Chelsea down the left hand side, but fails to create anything as his pass towards Fabregas is collected by Cech.

Bosingwa makes his way into the penalty area before firing a poor effort way over the bar. Perhaps he took the wrong option there.

Scoring goals isn't often a problem for Arsenal, but they have failed to find the back of the net in their last two league games.

Adebayor collects the ball on the right wing before curling a cross into the box, only for Pereira Neves Denilson to loft the ball over the bar.

A good spell for Arsenal now as Fabregas fires a long range effort straight into the arms of Cech. This is end to end stuff!

Adebayor fires a shot towards goal and although Petr Cech manages to save it, the ball almost falls to the waiting Gallas but is hacked away by John Terry.

Arsenal haven't got a very good recent record against Chelsea - in fact, they have only won one of the last twelve against them.

Chelsea come forward again, but Gallas intercepts in the nick of time to prevent Lampard sending Anelka through on goal.

Nothing comes from Frank Lampard's corner though and it's an Arsenal goal kick. A very lively start to this game!

Corner for Arsenal is headed away by Anelka and Chelsea are able to break through Kalou, who eventually has a shot deflected wide for a Chelsea corner.

There is no doubt that Chelsea have started as the better team in the opening exchanges - they've had plenty of the ball.

Arsenal attack for the first time through Emmanuel Adebayor, but he can't get past Jose da Silva Bosingwa and ends up giving a free kick away.

Manuel Almunia punches away a Deco cross before he eventually gathers the ball under pressure from Kalou.

Chelsea feel they should have had a penalty after Cesc Fabregas slid in on Nicolas Anelka - it seemed as though he got the ball though.

John Obi Mikel finds some space outside the Arsenal penalty area, but his deflected shot is blocked and cleared by Johan Djourou.

Souza Deco threads the ball into the path of Kalou, but the striker is caught offside before he can get a shot away. Anxious moment for Arsenal though.

Kalou and Bacary Sagna go up for the same ball and it's the Arsenal man who gets to it first to end any chance of a Chelsea attack.

Luiz Felipe Scolari could really do with a victory today because, as yet, his team have failed to beat any of the 'big four' this season.

Michael Ballack chips the ball towards Salomon Kalou, but William Gallas is there to intercept and clear the danger.

There is no doubt that Arsenal need to win this game today if they are to keep their title dreams alive - they have lost their last two league games.