West Ham let a two-goal lead slip to lose 4-2 to Watford in September and Masuaku felt that his team- mates would have a major point to prove against the Hornets on Saturday.
According to reports, Kiko Femenia has agreed to join Watford when his contract at Alaves expires in the summer.
Watford are reportedly among a number of clubs ready to battle it out for Roma forward Stephan El Shaarawy.
Arthur Masuaku believes his West Ham side will be looking for revenge after their 4-2 defeat at the hands of Watford in September.
Napoli midfielder Allan is believed to be a summer transfer target for Watford, according to reports.
Rumour has it the Watford boss has his eyes fixed on Serie A for potential summer transfers with Juventus' Lemina and Napoli's Allan - not for the first time in both instances - linked.
Mauro Zarate has already seen enough of Watford's ambition to claim that they will be challenging for a place in Europe or silverware.