Reading central defender Matt Mills will return from suspension.
Winger James Henry has a knock and will be assessed, while Ivar Ingimarsson (hamstring) is out and Marek Matejovsky is sidelined after a stomach operation.
MATCH PREVIEW
Relegation-threatened Watford are two places above the bottom three and go into their final home match of the season badly needing a win to ease their fears of the drop.
Tuesday's defeat at QPR continued their dismal away form. The Hornets are without a win in 16 away matches and are unlikely to relish the prospect of heading to Coventry on the final day of the season with their Championship status on the line.
Before that potentially crucial match, they could take a massive step towards safety if they defeat Reading, who have been beaten on only one of their last six visits to Vicarage Road.
Watford have lost their last two matches and won only one of their last nine, while Reading are heading for a mid-table finish to an arduous season. The Royals' cup exploits mean they have played 52 matches this term - more than any other Championship side.
MATCH FACTS
Head-to-head
• The last three matches between these clubs at Vicarage Road have ended in draws.
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• Reading have won only one of their last seven league meetings with the Hornets.
Watford
• Their 1-0 defeat at QPR was the first time Watford had failed to score in 10 games.
• Watford are one of five sides not to have lost a Championship match in which they have scored first.
Reading
• Reading have won only two of their last six matches, and have drawn their last two away matches.
• Brynjar Gunnarsson and Jobi McAnuff could play against their former club.
MOST RECENT MEETING
Reading 1-1 Watford (26 September 2009)
Reading scorer: Rasiak 7.
Watford scorer: Graham 66.
Source: BBC Sport
Source: BBC Sport