The defeat at the London Stadium was as damaging for the Blues as it was for the Hornets, who are battling to beat the drop.
Nigel Pearson’s side have suffered back-to-back defeats since a point on their return to Premier League football following the league’s suspension due to Covid-19.
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Frank Lampard’s side are now just two points ahead of Manchester United and Wolves in fourth, as the battle for Champions League football intensifies.
Here are the predicted line-ups for the game at Stamford Bridge.
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When is it and what time is kick-off?
The match will begin at 8pm on Saturday 4 July at Stamford Bridge.
How can I watch it online and on TV?
The match will be broadcast live on Sky Sports Premier League, Sky Sports Main Event and Sky Sports Ultra HD.
If you’re not a Sky customer you can grab a NowTV Day Pass here to watch without a subscription.
You can get a live stream through NowTV or the Sky Go app.
Mateo Kovacic came off at the London Stadium with a knock and could be a doubt here, while Fikayo Tomori is nearing a return to fitness having just missed out midweek.
Andre Gray, Domingos Quina and Nathaniel Chalobah have been missing after being reprimanded for breaching lockdown rules. While Isaac Success, Daryl Janmaat and Gerard Deulofeu should all be out once more.
Chelsea predicted X: Kepa; James, Rudiger, Zouma, Azpilicueta; Kovacic, Kante, Mount; Willian, Giroud, Pulisic
Watford predicted XI: Foster; Femenia, Cathcart, Dawson, Masina; Hughes, Capoue; Sarr, Doucoure, Pereyra; Deeney
Chelsea’s defensive fragility was on full display at the London Stadium and Nigel Pearson will hope to expose that once again. But Frank Lampard’s anger following the defeat against West Ham suggests he should get a reaction here and for all their problems at the back, even with Tammy Abraham struggling, the Blues pose a threat going forward. Christian Pulisic is enjoying his best form since joining the Blues and we expect the hosts to have just enough to maintain the required pace in the battle for a top four finish. 2-1.