Watford's Lloyd Doyley and Will Buckley have hamstring strains and will undergo late fitness tests along with Heidar Helguson, who is carrying a knock.Henri Lansbury and Jon Harley are both suspended, while Tom Cleverely has been ruled out for the rest of the season with knee ligament damage.
Plymouth skipper Carl Fletcher and winger Craig Noone are hoping to return after their respective knee injuries.
But Kari Arnason (hip) and Krisztian Timar (hamstring) are sidelined.
MATCH PREVIEW
Struggling Watford and Plymouth meet in a crucial relegation showdown at Vicarage Road, which both relegation-threatened sides dare not lose.
Watford, without a win in six matches, are above the drop zone only on goal difference and four points ahead of Plymouth, who desperately need to win this game.
Back-to-back away victories have given Plymouth a fighting chance of staying up, but a defeat against the Hornets could leave them on the brink of falling into League One.
Watford can also ill afford to lose this one, not least because three of their last four matches of the season are away from home. They will sink into the bottom three if Sheffield Wednesday, who visit Middlesbrough, better their result on Saturday.
MATCH FACTS
Head-to-head
• Plymouth have won 30 and Watford 15 of the previous 59 matches between these clubs.
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• Argyle have won on their last two visits to Vicarage Road, and been beaten only once in their last six matches there.
Watford
• Watford have failed to keep a clean sheet in their last 12 matches, and have won only one of those games.
• They are the only team in the Championship not to have lost a league game in which they have scored first.
Plymouth
• Plymouth have won three of their last seven league games.
• Victory would mean three consecutive away wins for the first time since December 2003.
• Defeat would see Watford become the fifth side to complete a league double over Plymouth this season. West Brom, Blackpool, Sheffield United and Sheffield Wednesday have already beaten them both home and away.
MOST RECENT MEETING
Plymouth 0-1 Watford (15 September 2009)
Watford scorer: Cleverley 4.
Source: BBC Sport
Source: BBC Sport