Last Updated: 17/11/12 4:54pm
The home fans are already launching into song as it looks to be all three points for Clarke and his boys.
Chelsea throwing everything at it with even Cech coming up for the set-piece, the Blues goalkeeper almost booting in a possible leveller at the far post.
Mulumbu has been moved out on to the left flank in order to lessen his impact on the game due to his injury.
Mata and Oscar combine to feed Sturridge at the far post, but the Blues ace really should've done better with chance to draw his team level, his strike way off the mark.
All the play is taking place inside the Baggies's half of the field with the Blues relentless on attack.
Blues whipping in balls for attackers in the box from all angles, but Myhill is marshalling his troops well at the back.
Mulumbu is hoppling with what looks to be a serious hamstring injury, but Clarke's all-out of substitutions.
Ramires now on the park, Mikel having gone the other way, and immediate tries to create something going forward for the Blues
Long comes off to a standing ovation as Markus Rosenberg takes to the field for the final ten minutes.
Chelsea back on Albion's door-step, banging on the door that has Steve Clarke's men pulling out all the stops to keep the west Londoners at bay.
Mata picks out Sturridge with the Blues striker blazing towards goal, who then whips in a low drive that draws a fine left-handed parry from Myhill.
The Blues keeping the game inside the Baggies's half, although as the clock winds down the home side are less afraid to work hard on defence.
Chelsea push up again, but they must be out on their feet having to now launch their attacks from deep with Albion unafraid to counter.
Moments after Mulumbu's fine strike from range at Cech, Graham Dorrans comes on for the influential Morrison as Gera also depart for Chris Brunt.
Myhill can't do no wrong right now as he gathers Mata's cheeky effort from a tight angle at the near post.
Long breaks out down the right flanks only to drift out to far and get closed down by the cover defence.
Baggies just about contain the latest barrage on their goalmouth, before looking to launch a counter.
Mata making a real impact off the bench for the Blues as he goes opn another run before trying to feed a team-mate.
Mata already making his mark, the Spaniard chipping the ball over the defence for Sturridge inside the box that Myhill just manages to parry away from the sliding striker.
Albion try to power their way out of their half, but the likes of Torres and Hazard just drive them back.
The crowd give a cheer as Morrison rise after receiving treatment following the hit from Cahill, as Oscar and Mata warm up for Chelsea on the sidelines.
Morrison, again, tries to weave his way through the Blues defence and draws a free-kick on the edge of the box via Cahill's robust challenge.
Morrison looking to jink his way down the left flank, with Long next trying his luck only for Cahill to clean him out legally.
Myhill bravely throws himself at the feet of Moses to smother a loose ball which the Blues ace was looking to smash into the back of the net.
Long making a real nuisance of himself as the striker rise to try and meet a long ball into the box that Cech just manages to gather.
Jonas Olsson putting the hard graft for the hosts as he clears another ball into the danger area from Chelsea.
Back behind on the scoreboard, the Blues push up in earnest as the Baggies defence holds their line.
Great cross from Long out on the right sees Odemwingie head the Baggies back into the lead with a fine finish at the near post.
Sturridge and Hazard look to link up out on the right, before play is switched to the opposite flank.
The Blues strong out the blocks as Bertrand delivers a teasing ball towards the back post for Moses that requires a clearing header from Ridgwell.
Baggies withstand a late surge from the Blues with Torres trying to sneak a boot in on a loose ball in the box.
Moses blazes his shot wide from the right when he should've maybe looked to cut the ball across the face of goal for Sturridge.
Luiz's attempt from the set-piece is deflected out for a corner, but Hazard's delivery is weak and the danger for the Baggies is averted.
Baggies now look to be sitting back and letting the Blues come at them, which may be a dangerous ploy now that the visitors have drawn level.
The tactical change from Di Matteo - Hazard out to the left - has bourne a goal and almost another as the Belgian lays the ball off for Sturridge to take another shot at goal.
Hazard heads the Blues level at the far post after Azpilicueta finds his team-mates with a good ball from the right.
Torres struggling to assert his authority in attack for the Blues as every attacking thrust right now seems to die with him.
Albion do well to contain Chelsea's latest surge, but their attempt to launch one of their own is unsuccessful.
Long does well to shrug off a poor challenge from Cahill to try his luck from out in front, his effort sliding wide of the far post.
Morrison, again, for Long inside the area with Cahill doing just enough to put off the striker's attempt on goal.
Sturridge, again, fancies a shot from range but Myhill sees the ball early and makes a reasonably comfortable save.
The match is being played just over the halfway line by the visitors, although the home side aren't shirking their defensive duties.
The Blues are getting upfield well but Hazard and Torres need to do more to hold the ball up much like Long has done for the Baggies.
Despite Luiz's attention, Long uses his upper-body strength well to hold the ball up and look to feed a team-mate.
Zoltan Gera almost manages to get on the end of Morrison's cross. who seems to find so much time on the ball to the ball away for his team-mates in good areas.
The Baggies push on the attack that sees the Blues put ten men behind the ball to keep the hosts at bay.
Long with an overzealous challenge on David Luiz that earns him a strong ticking off from the match referee.
Gary Cahill looks to lead the charge from the back with Azpilicueta and Bertrand also pushing up with more urgency.
Youssouf Mulumbu tries to get behind Chelsea's defence out on the right, but the ball runs away from him as he races to gather the pass forward.
Baggies with some time on the ball as they carrying it up strongly into the Blues's half of the pitch.
Torres attempts a cheeky back-heel for Sturridge who was bursting into the box, but his pass is intercepted.
Fernando Torres makes a beautiful turn and then tries to unsuccessfully step away from Claudio Yacob, leaving the Blues striker limping after the tough tackle.
Hazard finds Moses down the left wing, only for the former to fall over his own feet trying to deliver a cross into the area.
Long dives to brilliantly get on the end of a delightful cross from Morrison out on the left to give the Baggies the lead.
Eden Hazard claims for hand-ball inside the Baggies's box after his shot strikes a defender's hand following a decent attacking flurry from the Blues.
Peter Odemwingie bursts down the right and tries to feed Jamres Morrison, but the ball is cleared into touch before reaching him.
Petr Cech does well to come out and get low to smother the ball from under the feet of an onrushing Long.
Daniel Sturridge with the first shot on goal of the match, an off-target left-footed effort from range.
The Blues settling in as they pass the ball around at the back looking to get a feel for the pace of the game.
A rare start for young defender Cesar Azpilicueta as he makes an over exuberant tackle on Shane Long.
I think Chelsea will win 2-1. Sturridge will score but Odemwingie will equalise. Juan Mata will score a late winner. I dont think Torres should be starting. He isnt as good as when he was at Liverpool. Ibraheem Bahadur
muhammad hussain chelsea fan i supose our runof form hasnt been great in the past two wekks but anyway i am going for a 4-2 chelsea win torres hattrick hazaed to get fourth and for the baggies shane long and odemwingie
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Goalkeeper Boaz Myhill continues in goal for the hosts, with first-choice gloveman Ben Foster still on the treatment table with a groin injury. Defender Gareth McAuley failed a late fitness test after picking up a hamstring injury whilst on international duty in midweek. Midfielder Youssouf Mulumbu has recovered from a hamstring injury in time to feature. Striker Romelu Lukaku, who is on loan from Chelsea, will not be eligible to face his parent club.
Fifth place West Brom take on third place Chelsea with the draw proving popular with punters at 13/5. West Brom have won five of their last six matches at The Hawthorns and it's 11/4 they can extend that run against the European champions who are 10/11 to secure their first win in three games. Peter Odemwingie is 8/1 to break the deadlock for the Baggies, while seven of Chelsea's goals this season have come from defenders and it's 6/1 for Tim Cahill to score anytime for the Blues.
Having relinquished top spot to Manchester United a few weeks ago, Roberto Di Matteo's side have since dropped to third in the Premier League and come off the back of a 1-1 draw with Liverpool last weekend.
The fifth-placed Baggies have emerged as this season's surprise package under the guidance of Steve Clarke. They will also be in good spirits after a 2-1 triumph over Wigan last weekend saw them close the gap on the visiting Blues to four points.