Tiemoue Bakayoko's early red card reduced Chelsea to 10 men after just half an hour and they never recovered from that setback. Troy Deeney put Watford ahead from the spot before half-time, and despite Eden Hazard pulling one back, Watford could not be stopped.
Daryl Janmaat, Gerard Deulofeu and Roberto Pereyra all found the net in the final 10 minutes to see Conte suffer a second big defeat in a row.
Conte has been vocal about his desire to remain , but the club has yet to deny the rumours suggesting he is on the hot seat, and this performance is unlikely to lessen the heat on the former Juventus and Italy boss.
Supporters on Twitter were quick to voice their displeasure at the Blues boss, who has underperformed this season despite leading the side to the Premier League last year.
Breaking news: "Chelsea FC have sacked head coach Antonio Conte after a run of poor results the club confirmed on their website"— Niza (@TheGrandMaestor) February 5, 2018
This is the news I want to wake up to tomorrow. #CFC
When you remember who the owner of Chelsea is, then you get scared for Antonio Conte.— Okon 'Ediye' Nya (@iamOkon) February 5, 2018
2015-16 vibes. The death of Antonio conte. I can sense it, smell it, taste it. I want to snort it, inject it, inhale it.— Antonio Conte wears a wig (@CriminalCosta) February 5, 2018
Antonio Conte meeting Roman Abramovich in the morning: pic.twitter.com/rKJRf6V9gw— ᴺᴷ7 (@NGoloFC) February 5, 2018
Seems like conte will be out in feb.— NiiNiiFC-BlueLionsTV (@NiiNiiFC) February 5, 2018
We're Chelsea fans, we've seen this play out the same way, time & time again.
No sympathy from me, these managers are always scared to make changes or risks. They stick with their systems till the end.
Never accept their tactics dont work
Since Antonio Conte feuded with José Mourinho:— Not Match of the Day (@NOT_MOTD) February 5, 2018
Wins: 2 Draws: 5
Out of the League Cup
4th in the League pic.twitter.com/p1smu7G4LY
Roman has clearly lost his ruthless. Back in the day he’d have sacked Conte in the locker room & Cahill would probably come out as manager in the 2nd half— Simeon (@SJftbl) February 5, 2018
It’s clear the players want Conte out. Costa saga never sat right with them. Haven’t tried once today, speaks volumes.— CarefreeDaily (@CarefreeDailyFC) February 5, 2018
Watford 3-1. And that’s surely the end of the road for Antonio Conte. Sad.— Chelsea HQ (@Chelsea_HQ) February 5, 2018
Chelsea losing but now they might finally sack Conte pic.twitter.com/fN8FuXUuaB— 20 Wave Caps (@CapreseMus) February 5, 2018
Antonio Conte on the ropes at Chelsea? pic.twitter.com/gaNhae8RKP— Liam Canning (@LiamPaulCanning) February 5, 2018
Chelsea are next in action against West Brom at Stamford Bridge on Feb.12. It remains to be seen if Conte will still be with them.