Watford boss Walter Mazzarri admitted his side had been made to pay for wasting their first-half chances, with Odion Ighalo and Miguel Britos the main culprits.
Asked if he was concerned after four defeats in five games, Mazzarri said: “I see mainly the performances, not too much the end result. I see the performances and the way we play.
“Of course there is something I will need to improve, and it’s to score. All the other teams I see when they get to the final 20 metres, they manage to score, the clear occasions, and we don’t, so this is something that we need to work on.
“If you look at the game against Everton, we had some chances and [Stefano] Okaka took them and we won the game. Today, the chances were even much easier than the ones against Everton, but if we don’t score, we don’t win.
“The way we played, we cannot miss all the chances that we have created. We know that in the Premier League, if you miss these chances, then you can be punished. This is football and this is what happened today.”