The victors had the chance to kill the game late-on as Isaac Success was put through on goal, however the 21-year-old striker was unable to convert the chance with the Wearsiders' young goalkeeper coming out on top in the one-on-one situation.
"The only thing is we should have scored at least one more goal",
"Their goalkeeper was very good. We need to improve, especially improve in the last 25 yards with the final pass.
"Success had a very good chance and we had to take it. This is something we have to improve."
The win sees Watford climb to within two points of ninth-placed Stoke City, who still have a game in hand, and all but secured their Premier League status for next season.
However, the 55-year-old Italian is not too concerned with the standings, and is more concerned about his side's performances on the pitch.
"I don't look at how many points we need. I'm not looking at this," the Hornets manager added.
"I'm looking at the game by game and how to improve. For example, to move better with the ball, to be sure to know where you pass it. This is how we improve."