Chelsea boss Antonio Conte said he took responsibility for failing to motivate his side in Sunday's defeat by Manchester United.
Former Chelsea and Ivory Coast striker Didier Drogba has joined United Soccer League side Phoenix Rising as a player and co-owner.
Chelsea maintained a seven-point advantage over Tottenham at the top of the Premier League with a hard-fought victory over Manchester City.
Tottenham midfielder Erik Lamela has been ruled out for the rest of the season because of a hip injury.
Chelsea remained firmly on course for a domestic Double as N'Golo Kante's second-half winner settled a stormy FA Cup quarter-final meeting with Manchester United at Stamford Bridge.
Frank Lampard has told Soccer AM he would love to return to Chelsea but has no plans to decide on his next move before January.
Chelsea Football Club's wage bill shot up £25 million in the year to 30 June 2015, its latest Companies House filing shows.
Manchester United midfielder Michael Carrick says it is "disrespectful" to claim the club's players are not trying their best for manager Louis van Gaal.
Chelsea owner Roman Abramovich would be "foolish" to sack manager Jose Mourinho, says former Manchester United boss Sir Alex Ferguson.