The Hornets have been the Premier League's surprise package this season and are riding high in fourth place heading into the weekend's early kick-off (12.30pm).
That is thanks to a third consecutive game in which they have changed the outcome with a late goal. Tom Cleverley‘s injury-time strike a week ago secured a 2-1 win over Arsenal at Vicarage Road, lifting the Hornets into the Champions League spots.
Chelsea, meanwhile, were beaten 2-1 at previously winless and goalless Crystal Palace last weekend. They followed that disappointment up by blowing a two-goal lead to draw 3-3 with Roma in the Champions League in midweek.
Hornets boss Silva still has a longer than ideal injury list with Isaac Success (knee), Nathaniel Chalobah (knee), Younès Kaboul (hamstring), Craig Cathcart (knee) and Tommie Hoban (knee) all sidelined. Sebastian Prödl (knee) could return but he is a doubt.
The big decision for the Portuguese coach will be over whether to start skipper Troy Deeney or Andre Gray up front. Silva plumped for the latter against the Gunners before introducing Deeney in the second half. The Hornets' No.9 made a game-winning impact and could be rewarded with a start.
After switching to a back three for the Arsenal game, Silva abandoned the system in the second half and reverted to a four-man defence. He should start as Watford finished for the trip to west London.
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