Swansea City are expected to welcome back both Scott Sinclair and Stephen Dobbie from hamstring and ankle problems respectively.
David Cotterill (groin) is out after being forced off in Saturday's loss at Nottingham Forest, while Darren Pratley (shoulder) faces a late fitness test.
MATCH PREVIEW
After another thumping win on Saturday, Watford are third in the table and have every reason to be in buoyant mood. They followed the recent 6-1 mauling of Millwall with a victory against Middlesbrough at the weekend - the Hornets' third win in a row and their first of the season at home.
Danny Graham's two goals on Saturday against the club that released him took his tally for the campaign to eight, and made a mockery of pre-season predictions that his current side would struggle and his former one would be title contenders. Boro are struggling, while Watford are third.
They could move into the top two if they beat Swansea, who have won all four of their home matches this term but lost all four of their away games, with the most recent defeat coming in Saturday's 3-1 reverse at Nottingham Forest.
Watford fans would like nothing more than to see their team condemn Swans boss Brendan Rodgers to another away loss. Rodgers, who left the Hertfordshire club last year to embark on an unsuccessful spell as Reading manager, is sure to get a hostile reception on his return to Vicarage Road.
MATCH FACTS
Head-to-head
• Swansea's 1-0 win at Watford in March was their first away victory against the Hornets in 32 years, and followed three consecutive defeats for the Welsh club at Vicarage Road.
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Watford
• A win for Watford would mean four consecutive league victories for the first time since October 2007.
• They have scored a total of 11 goals in their last three matches.
• Watford have scored 10 first-half goals this season - more than any other Championship side.
• The Hornets are yet to keep a clean sheet at home.
Swansea
• Including last season, Swansea have suffered eight successive away league defeats, and have not won a league game on the road since their last visit to Watford, in March.
• Swansea are one of three clubs without an away point in the Championship this season.
Source: BBC Sport
Source: BBC Sport