First-half goals from Didier Drogba earned Chelsea a 2-0 win over Arsenal at Stamford Bridge on Sunday, securing them a return to the top of the Premier League, two points ahead of Manchester United.
Jose Mourinho left Stamford Bridge because his relationship with Chelsea had broken down and the effects could be seen in their results, the Premier League club said.
Two Robin van Persie goals earned the Gunners a 2-1 victory as Chelsea slid to a second home league defeat of the season.
The Stamford Bridge clash (2130 IST) is one half of a heavyweight Sunday double bill as Manchester United also visit Manchester City (1900 IST).
Leeds United sent Manchester United crashing to their most embarrassing FA Cup defeat for 26 years when they scored a shock 1-0 third-round victory at Old Trafford on Sunday. Holders Chelsea made sure there was no slip-up at Stamford Bridge where they crushed Championship (second division) Watford 5-0 while Arsenal, the second most successful club in the cup's history with 10 wins, left it late to beat West Ham United 2-1.
Former Chelsea manager Jose Mourinho says he wants to return to England to coach, hinting he could be back with a Premier League club for the start of next season.
Having spent much of his time at Chelsea operating in Eden Hazard's shadow, Willian has emerged as a leading light in the team ahead of their Champions League showdown with Barcelona.
Captain John Terry's headed goal after 76 minutes at Stamford Bridge was enough to give Chelsea a victory they just about deserved to put some daylight between them, Arsenal and Manchester United at the top of the table.
Last season's beaten Champions League finalists, began their new campaign with a convincing 4-0 victory over Girondins Bordeaux in their Group A match at Stamford Bridge on Tuesday.
A tap-in by Karim Benzema and a powerful strike by substitute Marco Asensio earned European champions Real Madrid a 2-0 win over 10-man Chelsea.
Chelsea and Liverpool, the only teams to start the English Premier League season with two wins, lost their 100 percent records on Sunday when they drew with Tottenham Hotspur and Aston Villa respectively. Chelsea had scored five goals and conceded none in their opening wins, while Spurs lost both theirs but they drew 1-1 at Stamford Bridge after Darren Bent cancelled out Juliano Belletti's opener for the home side.
Favourites Chelsea will play Tottenham Hotspur in the FA Cup quarter-final tie at Stamford Bridge next month.
Title rivals Chelsea have been handed an unfair advantage over Manchester United by the scheduling of Saturday's potential Premier League decider, United manager Alex Ferguson said on Friday. The two clubs meet at Stamford Bridge in a lunchtime kick-off on Saturday with United knowing that victory will give them the title for the second year running.
Chelsea trimmed Manchester United's lead at the top of the Premier League to five points on Sunday with a patchy 1-0 defeat of Middlesbrough.
A summary of Wednesday night's matches in the Champions League.
West Ham United and Chelsea both narrowly avoided ignominious FA Cup exits with narrow wins against lower-league opposition but Everton marked Frank Lampard's first game in charge by sauntering past Brentford into the fifth round on Saturday.
Both managers were fined by the FA but only Tuchel will serve a ban as he was found "largely culpable" for the fracas following the managers' post-match handshake.
Chelsea's 0-0 home draw with second-placed United ensured Thomas Tuchel is still undefeated in nine games since replacing Frank Lampard, but it meant they failed to dislodge fourth-placed West Ham United who became Manchester City's 20th successive victims in all competitions on Saturday.
Chelsea midfielder Frank Lampard will miss the next few weeks after tearing a muscle in his right thigh.
Liverpool striker Peter Crouch has accused foreigners of play-acting following his sending off for a robust challenge on Chelsea's Jon Mikel Obi on Wednesday.
Jose Mourinho has invited the Football Association to approach him about the vacant England manager's job.
Holders Chelsea will meet Liverpool at Stamford Bridge in the quarter-finals of the League Cup next month.
Last season's beaten finalists Arsenal travel to Blackburn Rovers, while Manchester City play Tottenham Hotspur and West Ham United host Everton in the other games.
Chelsea could step up the pursuit for Champions League title by signing two of the biggest names in world football
A draw for Jose Mourinho's side will finally extinguish Manchester United's hopes of a first championship since 2003
CFR Cluj will create the upset of the season if they avoid defeat against Chelsea at Stamford Bridge on Tuesday and help stop last season's beaten finalists advancing to the last 16 of the Champions League. Chelsea have already failed to beat Cluj in the competition having drawn 0-0 in their first meeting in Group A in Romania in October.
The Dutch striker has spent four seasons at Stamford Bridge, making 177 appearances and scoring 87 goals.
The French defender smashed home a superb stoppage-time winner to give champions Chelsea a 2-1 victory over Tottenham Hotspur.
Cesc Fabregas hopes the beginning of his tenure as Arsenal's club captain can signify a fresh start and a turning point in their season.
The top four failed to muster a goal on Saturday as Chelsea, Liverpool and Manchester United drew 0-0 while Arsenal went down 3-0 at Manchester City. Premier League leaders Chelsea could find no way through Newcastle United at Stamford Bridge. Liverpool had the same problem at home to Fulham and third-placed Manchester United were held 0-0 in a lively game at Aston Villa.
Chelsea will be hoping to emulate London rivals Arsenal by beating Barcelona in their Champions League first knockout round tie.
Chelsea set an unbeaten home record of 64 matches during their 3-2 win over Birmingham City.
Chelsea striker Didier Drogba has been charged with violent conduct by the Football Association after he threw a coin towards Burnley fans during the League Cup, fourth-round tie at Stamford Bridge Wednesday.
The 22-year-old has signed on an eight-and-a-half-year contract in deal worth 100 million euros ($108 million).
Chelsea have another chance to show off their new expansive style on Wednesday when AS Roma visit Stamford Bridge in the Champions League.
Chelsea stayed top of the Premier League with a 2-0 victory over Aston Villa at Stamford Bridge on Sunday while Liverpool kept pace after an astonishing comeback earned them a 3-2 win at Manchester City.