Currently 10th in the Premier League at present, Watford coach Quique Sanchez Flores has a fixture against Chelsea to prepare for on the Wednesday after the cup game.
But the Spaniard made just four changes to his starting line-up for the 3rd Round tie with Newcastle United and it was regular starter Troy Deeney who netted the only goal of the game just before half-time.
"We are very happy because we are in the next round and that was the target," said Sanchez Flores after the Newcastle tie.
"We respect the cup and we try to put out the best team that is possible. We try to be competitive in every competition so for us it is a very happy day."