The Hornets sit 17th, one place and one point above the drop zone after three successive defeats.
Nigel Pearson’s team simply have to beat the Canaries, who are rock bottom without a point since the resumption of league action.
Norwich’s players looked enormously deflated after their weekend loss at home to Brighton and their fate will be all but sealed if they don’t win this one.
Here’s everything you need to know ahead of the crunch clash.
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When is it and what time is kick-off?
The match will kick off at 6pm at Vicarage Road on Tuesday 7 July.
How can I watch it online and on TV?
The match will be shown live on Sky Sports Premier League and Sky One, as well as Sky Sports Arena and Pick.
Sky Sports subscribers can also stream the game on the Sky Go app. If you’re not a Sky customer, you can grab a NOWTV Day Pass here to watch without a subscription.
Watford have no new injury worries. They remain without Isaac Success, Daryl Janmaat and Gerard Deulofeu.
Norwich are similarly unaffected by new injuries, with Grant Hanley and Christoph Zimmermann ongoing absentees. Sam Byram is also on the long-term injury list.
Watford: Foster; Femenia, Kabasele, Cathcart, Masina; Capoue, Hughes; Sarr, Doucoure, Welbeck; Deeney.
Norwich: Krul; Aarons, Klose, Godfrey, Lewis; Trybull, Tettey; Buendia, Cantwell; Idah, Pukki.
What are the odds?
Watford – 13/19
Draw – 3/1
Norwich – 19/4