West Ham have looked slow, laboured and well off the pace during pre-season and their two Premier League games.
Watford face off against West Ham in the Premier League at Vicarage Road on Saturday afternoon.
"We will miss Troy because he is a very important player for us but I know he will be supporting us in the next games".
We could possibly see Femenía replaced with Daryl Janmaat in the Watford lineup against West Ham United.
Deeney, 31, started Watford's opening two league defeats against Brighton and Hove Albion and Everton.
The visitors were sunk by an early goal from Bernard but arguably played well enough to warrant a better result, and they will be hoping to ensure the upward curve continues here.
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Gracia has enjoyed a successful career with Watford to date, steering the club clear of a relegation scrap immediately after his appointment and achieving the club's most prolific Premier League campaign ever previous year, on top of the Cup run.
"In every game we need to show our desire, our passion and this way we have chances to win the games".
"If you had said to me when I was 14 that I could play just one game in the Premier League, I would have taken it like a shot".
Watford did equalise through Andre Gray, but new centre-forward Sebastien Haller netted twice in the second-half to get his campaign up and running.
Watford enter the game as the only side that have yet to register a point or a goal this season.
Just after the hour mark, Haller, who was signed for a club-record fee from Eintracht Frankfurt opened his scoring with a tap in, after converting Felipe Anderson's drilled cross.