Marco Silva admitted Watford suffered a “bad afternoon” against Manchester City but said they were not helped by poor refereeing decisions.
Watford started the day with the chance to move top of the Premier League but they were thrashed 6-0 by Pep Guardiola’s title contenders.
Watford boss Silva claimed two of City’s goals were offside, while also bemoaning his side being denied a possible penalty.
Kyle Walker’s challenge on Nathaniel Chalobah went unpunished, leaving Silva hinting at double standards in the officiating.
“I think the first goal was offside, the second goal we made a big mistake and maybe the third goal is offside too; this is the truth,” said Silva.
“We had one clear penalty. I’m sure it wouldn’t change the result, but would give more confidence in this moment. In the similar moments, they decide one moment for one side and not the same for the other side.”
He added: “It is a bad afternoon for us. Before the match we knew it was a tough day and a tough match.
“Congratulations to City, they deserved the three points. It’s clear we made some mistakes. I need to analyse what City created, they started the game very strongly.
“We learn everyday. It is a good match for our team to learn. We only lost three points. The score is heavy but this is football.
“In City’s last two games they scored nine goals, against Liverpool and then in the Champions League. We prepared to not concede but when you see the offsides, the penalties, it is not easy.
“We will rest tomorrow and on Monday the players come again to work hard. They need to look forward and prepare well for the next match.”