Watford may be without on-loan duo Henri Lansbury and Tom Cleverley, but Will Buckley is added to the squad after recovering from a thigh strain.
Lansbury has been laid low by a stomach bug this week and Cleverley suffered a knee injury during the midweek win against Sheffield United.
MATCH PREVIEW Oakwell has not been a happy hunting ground for Watford, who have only won one of their last seven league matches there and have been beaten on their last three visits.
The Hornets are looking to maintain the form they showed when they ended a worrying recent run by beating Sheffield United 3-0 on Tuesday. It was their first win in nearly two months.
Barnsley also enjoyed a morale-boosting midweek victory. They won 4-1 at Preston, which was their second win in three league games and the first time the Tykes have scored four this season.
Both these teams have had problems at the back. Barnsley have kept one clean sheet in 10 matches, and only managed four all season. And only Scunthorpe and struggling Reading have let in more goals away from home this term than Watford, who have shipped 26.
MATCH FACTS Head-to-head
• Watford's win at home to Barnsley earlier this season was their first in six matches against the Tykes.
Have your say on this match • That result means Watford have a chance to complete the club's first league double over Barnsley since the 2000/01 season.
• Four of Barnsley's five home wins in the Championship this season have been against top-half clubs.
• Jon Macken, who is three short of 100 career league goals, is set to make his 100th appearance for the club.
• Watford have lost their last two away games in the Championship, and not won in eight games on the road.
• They have managed just two points away from Vicarage Road since their 1-0 victory at Middlesbrough on 17 October.
• Jay DeMerit could make his 200th appearance for the Hornets.
MOST RECENT MEETING Watford 1-0 Barnsley (12 September 2009)
Watford scorer: Graham 54.