Last updated: 16th January 2009
Steve Clarke joined West Ham United as first team coach on the 15th September and ever since, the fragility of Chelsea;s defence has been questioned.
But how important was the former Scotland international at the west London club and can the Blues cope without him?
Clarke was a part of the coaching set up at Stamford Bridge for the first four games of the season, and when he left for east London, Chelsea were sitting pretty at the top of the league.
Luiz Felipe Scolari's side recorded three wins and a draw in those four matches, scoring nine and conceding just two.
| P | W | D | L | Pts | F | A | Points/Game | Goals A/Game | |
| With Clarke | 4 | 3 | 1 | 0 | 10 | 9 | 2 | 2.5 | 0.5 |
| Without Clarke | 17 | 9 | 5 | 3 | 32 | 31 | 10 | 1.88 | 0.59 |
Since Clarke's departure, Chelsea's faltering fortunes have left the club lying third in the league four points behind Liverpool, and if United win their game in hand, five behind them.
They have only averaged 1.88 points per game since he left as opposed to 2.5 beforehand.
In recent weeks, much has been said about Chelsea conceding from set plays and crosses, and indeed their last five goals conceded have all originated from crosses (the yellow shows fixtures with Clarke).
| Date | Scorer | Team | Goal Type | Cross |
| 31-Aug-08 | Bent | Tottenham | Open | |
| 13-Sep-08 | Robinho | Man City | Direct Free-Kick Shot | |
| 21-Sep-08 | Park | Man Utd | Open | |
| 26-Oct-08 | Bosingwa | Liverpool | Throw | |
| 30-Nov-08 | van Persie | Arsenal | Open | |
| 30-Nov-08 | van Persie | Arsenal | Free Kick | |
| 14-Dec-08 | Bellamy | West Ham | Open | |
| 28-Dec-08 | Dempsey | Fulham | Free kick | Cross |
| 28-Dec-08 | Dempsey | Fulham | Corner | Cross |
| 11-Jan-09 | Vidic | Man Utd | Corner | Cross |
| 11-Jan-09 | Rooney | Man Utd | Open | Cross |
| 11-Jan-09 | Berbatov | Man Utd | Free Kick | Cross |
Seven of Chelsea's nine goals conceded have come from set pieces; accounting for 58% of their total goals conceded, the second highest percentage, behind only Manchester United.
Many feel that Clarke's departure has resulted in a lack of discipline and increased confusion at the back and these statistics go some way to supporting that.

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| Time | Fixture |
|---|---|
| Wednesday 10th February | |
| Barclays Premier League | |
| 19:45 | Arsenal vs Liverpool |
| 19:45 | Aston Villa vs Man Utd |
| 19:45 | West Ham vs Birmingham |
| 19:45 | Wolverhampton vs Tottenham |
| 20:00 | Blackburn vs Hull |
| 20:00 | Everton vs Chelsea |
| Tuesday 16th February | |
| Barclays Premier League | |
| 19:45 | Stoke vs Man City |
| Wednesday 17th February | |
| Barclays Premier League | |
| 20:00 | Wigan vs Bolton |
| Saturday 20th February | |
| Barclays Premier League | |
| 12:45 | Everton vs Man Utd |
| 15:00 | Arsenal vs Sunderland |
| 15:00 | West Ham vs Hull |
| 15:00 | Wolverhampton vs Chelsea |
| 17:30 | Portsmouth vs Stoke |
| Sunday 21st February | |
| Barclays Premier League | |
| 14:00 | Aston Villa vs Burnley |
| 15:00 | Fulham vs Birmingham |
| 15:00 | Man City vs Liverpool |
| 16:15 | Wigan vs Tottenham |
| Monday 22nd February | |
| Barclays Premier League | |
| 20:00 | Blackburn vs Bolton |
| Tuesday 23rd February | |
| Barclays Premier League | |
| 20:00 | Man Utd vs West Ham |
| Saturday 27th February | |
| Barclays Premier League | |
| 12:45 | Chelsea vs Man City |
| Time | Result |
|---|---|
| Tuesday 9th February | |
| Barclays Premier League | |
| Man City 2 - 0 Bolton | |
| Wigan 1 - 1 Stoke | |
| Portsmouth 1 - 1 Sunderland | |
| Fulham 3 - 0 Burnley | |
| Sunday 7th February | |
| Barclays Premier League | |
| Birmingham 2 - 1 Wolverhampton | |
| Chelsea 2 - 0 Arsenal | |
| Saturday 6th February | |
| Barclays Premier League | |
| Liverpool 1 - 0 Everton | |
| Hull 2 - 1 Man City | |
| Stoke 3 - 0 Blackburn | |
| Bolton 0 - 0 Fulham | |
| Sunderland 1 - 1 Wigan | |
| Man Utd 5 - 0 Portsmouth | |
| Burnley 2 - 1 West Ham | |
| Tottenham 0 - 0 Aston Villa | |
| Wednesday 3rd February | |
| Barclays Premier League | |
| Fulham 1 - 0 Portsmouth | |
| Tuesday 2nd February | |
| Barclays Premier League | |
| Hull 1 - 1 Chelsea | |
| Monday 1st February | |
| Barclays Premier League | |
| Sunderland 0 - 0 Stoke | |
| Sunday 31st January | |
| Barclays Premier League | |
| Man City 2 - 0 Portsmouth | |
| Arsenal 1 - 3 Man Utd | |
| Saturday 30th January | |
| Barclays Premier League | |
| Birmingham 1 - 1 Tottenham | |
Portsmouth left it late to grab a point while Manchester City and Fulham were comfortable winners.
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See all the goals and major incidents involving YOUR team, right here on skysports.com.
Portsmouth left it late to grab a point while Manchester City and Fulham were comfortable winners.
Norwich's success this season means more to Chris Martin than most, as Chris Burton found out.
Follow the rumour mill with all the latest gossip and speculation from the newspapers.
See all the goals and major incidents involving YOUR team, right here on skysports.com.
Skysports.com looks back at the weekend action before considering the next round of matches.