Watford goalkeeper Ben Foster said "shock" and "embarrassment" were the emotions in the dressing-room after his side were annihilated 8-0 at Manchester City. 

Bernardo Silva claimed his first top-flight hat-trick as Pep Guardiola's side ran riot at the Etihad Stadium to move back within two points of Premier League leaders Liverpool.

Sergio Aguero also got on the scoresheet along with David Silva, Riyad Mahrez, Nicolas Otamendi and Kevin De Bruyne.

Watford were 5-0 down inside 18 minutes on a dreadful day at the office.

"It's probably a bit of shock, embarrassment," Foster said afterwards. "I think we let ourselves down today and the fans a bit. We on the pitch didn't give it all we have got." 

Guardiola's men had 28 shots against the Hornets, whose hopes of exacting revenge for their 6-0 FA Cup final shellacking looked unlikely when David Silva opened the scoring after 52 seconds.

Boss Quique Sanchez Flores understandably did not have anything positive to reflect on after City's early gut punch left his side flailing.

"Well, first (we need) to say sorry to the fans because they came to the stadium waiting for a good performance from the time," he said after his second match since returning to the hotseat ended in embarrassment.

"It was very difficult to be on the pitch today. After 30 seconds, we realised it will be maybe tough. After 10 minutes, it was really very, very difficult. And after 15, it was impossible to play like this.

"If you say you are going to play against Manchester City and you are going make many mistakes, of course it will be very tough for us.

"We did in different ways. Not always the same.

"We concede the first five goals all in different ways, so it is probably because we were slowly or always behind the ball or the decisions of the players. We need to accept the situation."

Meanwhile Guardiola called his men a "joy to watch".

Last weekend's shock loss to Norwich is now far in the rear-view mirror, thanks to the midweek Champions League triumph at Shakhtar Donetsk being followed up by the club's biggest ever top-flight victory.

"It is weird, it is not normal," Guardiola said of his side's start at the Etihad Stadium. "Five shots, five goals.

"In the same time we gave them two chances to score two goals that we were lucky in this time it didn't happen when in the past it sometimes happened.

"But the quality of the players up front made the difference, so the quality that we have is a joy to watch.

"After 5-0, the game is completely different. Analyse after that, the mood one team, the mood the other team. The relaxation you play with, the tension they play with, so it's difficult to say.

"We were ruthless in terms of five shots, five goals. Sometimes we shoot 25 times or 15 or 20 and you cannot do it.

"So, after the Champions League and a huge trip back home, no time to prepare, rest and everything.

"It was a lovely day for all of us, for our City fans, a lovely day in the sunshine and a lot of goals."