Chelsea suffered a shock defeat and their first home loss in the Premier League this season when Sunderland beat them 3-0 thanks to goals from Nedum Onuoha, Asamoah Gyan and Danny Welbeck on Sunday.
If Manchester United are to claim a seventh successive Premier League victory and condemn leaders Chelsea to a first home league defeat of the season their manager Louis van Gaal must solve another complex injury puzzle.
Chelsea must avenge their 2008 Champions League final defeat by Manchester United or face a trophyless season if they lose the all-English quarter-final which starts at Stamford Bridge on Wednesday (1845 GMT).
IMAGES from the EPL match played between Chelsea and West Brom at Stamford Bridge in London on Monday
After failing their first big test of the season by losing 1-0 at Manchester City last week, champions Chelsea face another tough examination when Arsenal visit Stamford Bridge in the Premier League on Sunday.
Manchester City sent Chelsea crashing to a 4-2 defeat to end their 37-match unbeaten record at Stamford Bridge and dent their Premier League title hopes on Saturday. The leaders, beaten at home for the first time in all competitions since November 2008, finished with nine men after having Juliano Belletti and Michael Ballack sent off late in the second half.
Phil Neville scored the decisive spot kick to give Everton a 4-3 penalty shootout win over holders Chelsea after their FA Cup fourth-round replay ended in a 1-1 draw after extra time at Stamford Bridge on Saturday.
Everton knocked holders Chelsea out of the FA Cup when they won their fourth-round replay 4-3 on penalties after a 1-1 draw at Stamford Bridge on Saturday.
Everton skipper Phil Neville scored the decisive spot-kick to give his side a 4-3 penalty shoot-out win over holders Chelsea after their FA Cup fourth-round replay ended in a 1-1 draw after extra-time at Stamford Bridge on Saturday.
Chelsea are brimming with confidence and, fortified by a seven-day break, go into Wednesday's Champions League last-16 return match as favourites to knock Paris St Germain out for the second season in a row.
A round-up of Wednesday's action in the UEFA Champions League.
Barracked by his former fans and wasteful in front of goal, new Chelsea striker Fernando Torres endured a forgettable debut on Sunday as his old club Liverpool had the last laugh with a 1-0 win at Stamford Bridge.
Chelsea manager Carlo Ancelotti has told arch rivals Arsenal that its time to show their mettle for the Premier League title.
Chelsea scored twice in the last two minutes in a stunning comeback against Aston Villa on Sunday only to concede an injury-time equaliser in a 3-3 draw that severely dents their hopes of retaining the Premier League title.
Champions Chelsea will kick off their title defence at home to promoted West Bromwich Albion on August 14, the English Premier League announced on Thursday. In another headline clash on the opening weekend, Newcastle United will mark their return to the top flight with a mouth-watering trip to Old Trafford against runners-up Manchester United.
Barcelona stand between Chelsea and a second successive appearance in an all-English Champions League final. Manchester United, who beat Chelsea on penalties in last year's final in Moscow, take a 1-0 advantage to Arsenal on Tuesday in the other semi-final.
Chelsea striker Didier Drogba has admitted that his club's recent downward slide in form has been the worst he has witnessed during his six-year time at Stamford Bridge.
Images from Sunday's action in the English Premier League.
Premier League leaders Chelsea suffered their biggest home defeat for nearly nine years when they were humbled 3-0 by Sunderland at Stamford Bridge on Sunday.
A young Arsenal side delighted a near capacity crowd at the Emirates Stadium with a scintillating 2-1 victory over Liverpool to secure a place in the League Cup quarter-finals on Wednesday.
Chelsea secured the Premier League crown in magnificent fashion on Sunday with an 8-0 thrashing of 10-man Wigan Athletic in a party atmosphere at Stamford Bridge.
A summary of Saturday's action in the Premier League.
Arsenal skipper Cesc Fabregas has criticized his club players for lacking a "winning mentality."
The good news for Schalke 04's defenders as they prepare to face Chelsea in their opening Champions League Group G match on Wednesday is that striker Diego Costa is nursing a slight hamstring injury.
Chelsea lost 4-2 at home to Manchester City and Arsenal closed within three points of the Premier League leaders with a 3-1 win at Stoke City marred by a horrific leg injury to Aaron Ramsey Saturday. City scored a memorable victory at Stamford Bridge where the drama started before kickoff with a first meeting between former Chelsea team mates John Terry and Wayne Bridge since news broke of Terry's alleged affair with Bridge's former girlfriend.
The Wolfsburg winger reckons he didn't enjoy Jose Mourinho's trust during his stay at Stamford Bridge
Chelsea have given under-fire captain John Terry several days off and he will miss Saturday's FA Cup fifth round tie against Championship (second division) side Cardiff City at Stamford Bridge.
Liverpool held their nerve to win an astonishing penalty shoot-out 11-10 and edge out Chelsea in the English League Cup final on Sunday after a rip-roaring contest had somehow ended 0-0 after extra time at Wembley.
Chelsea returned to the top of the Premier League when they convincingly beat Birmingham City 3-0 at Stamford Bridge on Wednesday.
New Chelsea manager Carlo Ancelotti began his first day at work for the London club by announcing the signing of Russia midfielder Yuri Zhirkov from CSKA Moscow on Monday. Ancelotti, Chelsea's fifth manager in two years, held a news conference at Stamford Bridge where he also said that captain John Terry, the subject of interest from Manchester City, was not for sale at any price.
Chelsea were heading for defeat against Fulham, but Drogba levelled with a 73rd-minute header before a Chris Smalling own goal gave them the win that re-opened their five-point lead over Manchester United, albeit with an extra game.
New Chelsea manager Carlo Ancelotti is well-trained in dealing with the whims of multi-millionaire footballers and club owners despite often coming across as shy and reserved. The 49-year-old won two Champions Leagues and a Serie A title during his eights years at AC Milan and is as qualified as anyone to take the reins at Stamford Bridge.
David Beckham can look forward to a return to Old Trafford after AC Milan were drawn against his former club Manchester United in the last 16 of the Champions League on Friday. Friday's draw also pitted Jose Mourinho, now coach of Inter Milan, with his old club Chelsea.
Gianfranco Zola was the darling of Stamford Bridge in his Chelsea days but the Italian has yet to win the hearts of West Ham United's faithful. Zola's transformation from midfield magician to coach has been a tough one, and on Sunday his relegation-threatened West Ham host Premier League leaders Chelsea in front of an Upton Park crowd rapidly losing confidence in his managerial ability.
Frank Lampard scored from the penalty spot as Chelsea restored their three-point lead in the English Premier League with an unconvincing 2-1 home win against bottom club Portsmouth at Stamford Bridge in London, on Wednesday. Champions Manchester United had pulled level on points after beating a weakened Wolverhampton Wanderers 3-0 on Tuesday in manager Alex Ferguson's 900th league game in charge.
Indian movie star and ardent Chelsea Football Club fan, Abhishek Bachchan was at Stamford Bridge in London recently to watch his favourite team's Champions League semi-final match against Barcelona. He was presented with the new Chelsea jersey by the club's CEO, Peter Kenyon, making him the world's first owner of the prestigious club's latest jersey.
Chelsea, and particularly striker Didier Drogba, are likely to be in big trouble with UEFA after chaotic scenes marred the end of Wednesday's Champions League semi-final second leg at Stamford Bridge. Andres Iniesta's stoppage-time equaliser for a 1-1 draw sent Barcelona through on the away goals rule and sent Drogba round the bend.
Everton secured their English Premier League status as Dominic Calvert-Lewin scored five minutes from time to snatch a thrilling 3-2 victory over Crystal Palace after they rallied from two goals down at a rocking Goodison Park on Thursday.
Chelsea winger Eden Hazard still hopes he can one day fulfil his dream of playing for Real Madrid.
Chelsea's commanding start to the Premier League season continued with a 3-0 victory over Aston Villa on Saturday as their rivals for the title continued to look vulnerable.
