Kalou slots the ball past Doyle after a through ball from Drogba but the linesman's flag is raised for offside

Kapo wriggles into the penalty area but cannot work his way past the stubborn Chelsea back-line and Carvalho wins the ball.

The fourth official indicates four minutes of added time

Chelsea look very comfortable coming into the closing stages of the game and the visitors look weary after being run ragged by their opponents

Drogba squeezes a pass through to Sidwell who turns and shoots from 18-yards, sending the ball inches wide of the far post

Play stops for a moment as Drogba receives treatment for a head injury on the pitch

Doyle rushes well out of his area to clear a dangerous through ball but finds Drogba on the half-way line with his clearance. The confident striker hits a shot at the empty goal from way out and just misses the target

Sebastian Larsson's corner finds the head of Ridgewell who cannot steer the ball towards Cech's goal. Chelsea look far from certain at defending set pieces without John Terry

Jerome gets behind the Chelsea defence and puts a cross into the mixer but Ben Haim boots the ball behind for a corner

Wright-Phillips swings in a high cross from the byline, searching for Drogba who did not close in on the ball quick enough

Wright-Phillips slides a low pass across the face of goal and Kalou is inches away from netting Chelsea's fourth of the afternoon.

Ricardo Carvalho and Tal Ben Haim have had a fairly comfortable second-half, and Steve Bruce will be hoping Cameron Jerome ban put an end to this

A beautifully flighted pass from Johnson finds Kalou in the six-yard box, but he is surrounded by white shirts and cannot get a shot away

Kalou pulls out to the left flank and drifts inwards before pulling the trigger but Doyle is equal to the shot

Malouda twists and turns on the edge of the area and then gets his shot away but does not trouble the keeper

Wright-Phillips slides a pass through to Kalou but it is just too far ahead of the striker and Doyle collects

Birmingham's passing is becoming very sloppy and they appear to be struggling greatly with the pace and power of Chelsea

Essien intercepts a pass brilliantly and runs at goal before striking the ball but fails to find the target this time

Ashley Cole hits a hopeful shot from range and sends it high over the crossbar

Johnson picks out Pizarro with a left-footed cross and he tries to prod the ball home, but finds the side netting

Birmingham get a cross into the danger area but do not have enough height up-front to challenge the Chelsea defence

The ball falls kindly for Pizarro in the box who shoots on the turn, but an impressive block from Ridgewell sends the ball over the bar

Medhi Nafti tries his luck from range but his shot trickles wide of the mark

Pizarro threads a pass through to Wright-Phillips on the corner of the penalty area and he lets fly, but sends the ball into the side netting

Kalou shows trickery on the edge of the penalty box and strikes the ball on the bounce but it is straight at Doyle

Steve Bruce's side look settled to go in at half-time level and are killing time with high, long passes into the Chelsea half

It is the away supporters who are making all of the noise inside Stamford Bridge at the moment, though the home side are on the attack again

A long ball catches out Johnson and Gary McSheffrey gets a low shot away but does not trouble Cech

Wright-Phillips tries to poke a pass through to Kalou who would have been through on goal but for a vital interception by Franck Queudrue

Kalou gets behind the Birmingham defence and lays the ball of for Frank Lampard but his shot is blocked on the line by Johan Djourou

A long ball from Michael Essien finds Kalou whose first touch is just ahead of himself and Doyle rushes off his line to smother the ball

Glen Johnson attacks the space on the right wing this time, but fails to pick out a blue shirt with his cross

Wright-Phillips is finding acres of space on the right flank at the moment. He reaches the byline and cuts the ball back for Kalou, but Liam Ridgewell intervenes

Chelsea go in search of a second goal but Kalou is caught offside this time

Wright-Phillips looks very sharp and runs at goal before flashing a shot across the face of goal, sending it inches wide of the target

Pizarro steers a Wright-Phillips cross goal-wards but does not beat Colin Doyle

It has been a bright start to the game by Chelsea who are putting plenty of pressure on Steve Bruce's side.

Pizarro almost gets his head to a Cole cross but a last ditch header from Johan Djourou clears danger momentarily for the visitors

Salomon Kalou lays the ball off for Florent Malouda eighteen-yards from goal but makes a mess of the opportunity and stabs the ball over the bar

Glen Johnson curls an inviting cross into the danger area and finds Shaun Wright-Phillips who cannot direct his header goal-wards

Mikael Forssell pulls the trigger from the edge of the area but his shot is straight at Petr Cech.

Claudio Pizarro is caught offside after a chipped pass from Frank Lampard who wears the captains armband in the absence of John Terry.

Ashley Cole finds space on the left flank but his delivery is poor and floats straight behind for a Birmingham goal-kick.