The Blues were thrashed 4-1 by Watford at Vicarage Road – the club's second successive defeat by a three-goal margin after the 3-0 defeat against Bournemouth.
Chelsea manager Antonio Conte was left ruing his own mistakes after a heavy 4-1 defeat to Watford at Vicarage Road on Monday Night Football.
Watford net three late goals to inflict another heavy defeat on Chelsea, who played an hour with 10 men following the dismissal of Tiemoue Bakayoko.
Chelsea manager Antonio Conte addresses the press before his side's trip to Watford on Monday.
Chelsea completed the signings of midfielder Ross Barkley, striker Olivier Giroud and versatile star Emerson Palmieri in the January transfer window.
Ernesto Valverde has backed Gerard Deulofeu to resurrect his career at Watford after admitting that the former Everton winger spell at Barcelona has not been as good as expected.
Gerard Deulofeu was linked with moves to Inter Milan and Napoli before sealing a loan move to Watford until the end of the season.
Barcelona winger Gerard Deulofeu is said to have emerged as a late target for Premier League strugglers Watford.
Marco Silva has left Watford, with the club claiming that an approach for his services - believed to be from Everton - led to a "significant deterioration in focus and results".
Charly Musonda has been given the green light to spend the rest of the season out on loan following the recent signing of Ross Barkley.
Marco Silva demands quality signings in the January transfer window amid links with Leicester City striker Islam Slimani.
Troy Deeney has emerged as one of Sam Allardyce's main targets for the January transfer window but the striker is not interested in a move to Everton.
Watford manager Marco Silva says the club have no plans of selling Troy Deeney in the January transfer window despite Everton's interest.
Watford look set to win the race for highly-rated teenage IFK Gothenburg goalkeeper Pontus Dahlberg, who has also been watched by Arsenal, Tottenham and Everton.
Richarlison's start to Premier League life has helped gain many admirers, with Tottenham said to be interested in his services.
Elsewhere, the Sam Allardyce era at Everton begins with a comfortable 2-0 victory over Huddersfield Town at Goodison Park.
Tottenham boss Mauricio Pochettino believes that Christian Eriksen may be suffering from some mental fatigue, but refuses to put his side's recent slip in form down to tiredness.
Richarlison has enjoyed a productive start to life in Hertfordshire and is reportedly attracting interest from Tottenham.
Will Hughes limped out of Watford's defeat to Manchester United and is now expected to miss the weekend clash with Tottenham Hotspur.
Ashley Young was one of the star players for Manchester United in their 4-2 win over Marco Silva's Watford at Vicarage Road on 28 November.
Matic was withdrawn early in the second half of United's 4-2 win over Watford on Tuesday (28 November).
Marco Silva's in-form side set to host to United, who produced a lacklustre display against Brighton and Hove Albion on Saturday (25 November).