Crystal Palace defender Mamadou Sakho has suffered a serious muscle tear in his calf and is out of action indefinitely.
Right-back Joel Ward will also miss the match after tweaking his calf, but Yohan Cabaye is available after shaking off a knock.
Watford are without left-back Marvin Zeegelaar, who is suspended for three matches after a failed appeal against a red card.
Miguel Britos and Kiko Femenia have minor problems and are doubtful.
Did you know?
All of Crystal Palace’s 10 Premier League goals this season have come at Selhurst Park. They have had 29 more shots on target at home than away (44 v 15).
Crystal Palace have won four of their last six home league matches against Watford, losing the other two.
Watford have more points (13) and the same number of goals scored (15) in eight away matches this season as in the whole of 2016/17.
Troy Deeney has scored the winner in both of the meetings between these sides at Selhurst Park, hitting both goals for Watford in a 2-1 win in February 2016 and then an own goal to hand the Eagles victory last season.
What the managers say
Roy Hodgson: "Three things that I will say are good about Watford: their athleticism, their work rate and the quality of their individuals."
See: Sakho set for spell on sidelines
Marco Silva: “It’s a tough month for everyone. But it’s one month to enjoy, with lots of games to play and an important moment of the year."
See: Richarlison to have pitch-time managed
Referee: Lee Mason
Assistants: Ian Hussin, Matthew Wilkes
Fourth official: Simon Hooper
