The Nigeria international missed the Hornet’s 2-1 defeat to Brentford last weekend due to a slight hamstring strain.
Troost-Ekong has not made an appearance for the London club since the 1-0 loss to Tottenham Hotspur at Vicarage Road on New Year’s Day.
The 28-year-old has made 16 league appearances for Watford this season.
His compatriot Samuel Kalu will however play no part in the game due to a knee injury.
The winger, who linked up with Watford from Ligue 1 outfit Girondins Bordeaux in January has made just two league appearances for the club.