The Eagles will head into the weekend a point clear of the bottom three following back-to-back victories against Middlesbrough and West Brom, but they have not recorded three straight league wins since September.
Palace’s home form has been particularly concerning this season, as they have lost eight of their last ten league matches at Selhurst Park, while they also lost 2-1 to Watford in the corresponding fixture last season.
Palace will have to do without Patrick van Aanholt for Saturday’s match, as he has failed to recover from the ankle injury he picked up against West Brom last time out, with Jeffrey Schlupp expected to deputise in his absence.
Loic Remy will also miss out and he is not expected to be fit until after the international break due to a muscular injury.
Watford will head into the match 13th in the standings and seven points clear of the relegation zone, but a run of three matches without a win, coupled with the form of some of the sides below them in the standings, means the Hornets are not yet assured of safety.
Boss Walter Mazzarri will expect an improvement from his side on Saturday, but he may head into the match without midfielder Etienne Capoue, who is a major doubt due to illness.
However, the news is better for Nordin Amrabat, who is expected to return for the first time since New Year’s Day following an ankle problem, while Daryl Janmaat has recovered from a groin issue.
The two sides played out a 1-1 draw in the reverse fixture at Vicarage Road earlier in the season, in what was Sam Allardyce’s first match as Palace manager.