Postpublished at 22:40 Greenwich Mean Time 5 February 2018
Right, that's your lot from us as Chelsea's bad 2018 continues.
We're back with FA Cup replay action tomorrow night. Hopefully see you then.
Cheerio.
Peryra strike, Deulofeu deflected effort & Janmaat's superb goal restore lead
Hazard's 25-yard finish had levelled, Giroud on for Chelsea debut
Deeney converts penalty for opener
Bakayoko caps miserable 30-minute performance with two yellow cards
Get involved - #bbcfootball
Gary Rose
Right, that's your lot from us as Chelsea's bad 2018 continues.
We're back with FA Cup replay action tomorrow night. Hopefully see you then.
Cheerio.
Watford 4-1 Chelsea
Chelsea
More from Chelsea boss Antonio Conte on 5 live: "Two yellow cards in a few minutes, for sure you have to pay attention to avoid this situation.
"It was a difficult moment for us and then to go down 10 men and play with 10 players it wasn't good.
"I didn't see what happened with the penalty. We lost the game, I think we started in a bad way. We were very poor.
"We tried to pay football but I think today we didn't show this and we showed an uncomfortable situation with the ball.
"In this situation the fault is the coach - maybe I made a bad decision today with the starting XI. When you start in this way and play in this way you have doubt about the game. During the game it is difficult to change something, afterwards you can understand it and make bad decision.
"The second half I saw a great will but at the same time a lot of confusions. We don't play in this way. We have to accept this and fight a lot in this season. it will be very difficult for everything."
Watford 4-1 Chelsea
Chelsea goalkeeper Thibaut Courtois: "Our start was maybe not the best. We lost too many balls. The red card was very light and the penalty was a clear dive. I tried to make myself small and if a striker puts his feet there. He clearly left his foot and dived, it shouldn't have been a penalty. In the second half we tried to fight with 10 men, we got a goal and instead of trying to look quickly for a second goal maybe we should have regrouped.
"We all know this kind of player. They see a goalkeeper coming, he manufactured the content. It was very, very light.
"I think we have to find our form from before new year. We have a tough month coming up. It is important for us to continue to work - heads high."
Watford 4-1 Chelsea
Chelsea
A bit more from Chelsea boss Antonio Conte, speaking to Sky Sports: "I tried to warn everyone about the difficulty of our path in the league and Champions League. We performed very bad but maybe I made the mistakes with the starting XI today.
"My choice was very poor I think. It was very difficult to change something tonight."
Watford 4-1 Chelsea
Watford
Watford boss Javi Gracia: "It was an unforgettable night. A great victory and a great match. I am very proud of my players today.
"You always try to look for the victory and play well. Today we played a good match, pressed high. OK, the match changed after the sending off but I think we played very well.
"Chelsea are a very big club, a big team. Today they had more difficulty because of the sending off but there was in the second half moments when they played better.
"I only think to get the next three points. Tomorrow we start training again to be ready for the next match."
Watford 4-1 Chelsea
Chelsea
Chelsea manager Antonio Conte has been asked about his future.
"My position? It is the same. I stay here, try to work and put all myself in the work.
"The pressure? Which pressure? What is the pressure?
"I work - if this is enough it is, OK. Otherwise the club has to take another decision."
#bbcfootball or text on 81111 (UK only)
ZigZak: I still support Conte shame on the fans calling for his head. But who can blame them, Hire and Fire is how the club has been run for a long time and it yielded results.
RobC: Typical knee jerk reaction after 2 bad results conte wont be sacked but probably gone in the summer
Watford 4-1 Chelsea
Watford
Watford's Daryl Janmaat: "I know I can score goals, I did it in the past last year against Chelsea as well. It is really good, I am happy for the team and it is a really important win. We pressed them well. We won a lot of second balls.
"Last week in Stoke we had a good result, a point there, and three points today. We have to build on from here because we want to be safe as soon as possible."
Watford 4-1 Chelsea
Watford
Watford forward Gerard Deulofeu on Sky Sports: "We are happy for these three points, the team fight at the beginning and we are worth this win. I'm so happy for my fist game at home.
On the penalty he won in the first half: "Daryl Janmaat gave me a good ball and I think it's a clear penalty. He (Thibaut Courtois) touched me.. I think."
#bbcfootball or text on 81111 (UK only)
Mesud Zaman: Absolute shambles. Conte has to go. Worst I've seen Chelsea play for as long as I've been watching football. Players are not playing for Antonio Conte. His tactics aren't helping either. He'll be gone in the morning and I'd probably have no empathy for him.
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Watford 4-1 Chelsea
Job done for Watford as new boss Javi Gracia enjoys the perfect home debut in the Hornets' dugout.
As for Chelsea, if Antonio Conte was under pressure before tonight...
Watford 4-1 Chelsea
Chelsea passing the ball about nicely now on the edge of the Watford area but it isn't going to matter. This is Watford's night.
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Roberto Pereyra
Scrap that!
What a finish!
Roberto Pereyra somehow bends a superb shot form a tight angle into the far corner as Chelsea's miserable night gets even worse.
Who saw this coming when Eden Hazard equalised?
Watford 3-1 Chelsea
A glimmer of hope for Chelsea?
There'll be SIX minutes of time added on...
Watford 3-1 Chelsea
That's Gerard Deulofeu final action of the night as he is replaced by André Carrillo.
Watford are not done yet, they are coming forward for another!
Gerard Deulofeu
Unbelievable!
It's game, set and match as Chelsea decide not to bother defending a Watford break.
Gerard Deulofeu drives into a space in the visitors' defence and clips a neat finish beyond Thibaut Courtois' reach.
Can't see a way back for Chelsea.
Daryl Janmaat
Well then!
What drama as Watford respond in some fashion. Daryl Janmaat plays a one-two with Roberto Pereyra before squeezing a shot into the back of the net.
Eden Hazard
Eden Hazard magic!
The forward digs out Chelsea with a real moment of quality, dropping his shoulder to open up space on the edge of the area before bending a superb strike into the far corner.
Harsh on Watford, but a wonderful goal.