Manchester City boss Pep Guardiola says there'll be no underestimating FA Cup final opponents Watford.

Their last FA Cup triumph was in 2011 when they beat Stoke City at Wembley. In the eight years since then, City have gone on to be crowned champions of England four times and won four League Cups.

"It is a cup final, anything can happen like a red card," said Guardiola, who is seeking to win the FA Cup for the first time in his third season in charge at City.

"In one game, anything can happen. Normally the better team wins but a decision of the referee could make the difference.

"In the Premier League you have another chance and can be more relaxed, but this is completely different."