With City looking to make it 10 games without defeat at Wembley, he says Saturday's game is an acid test of whether his players are ready for our Champions League tie with Real Madrid next month.
“This is a final," he said. “In finals there are lots of factors. Minimal details.
“Being strong in your head, how you overcome situations.
“Mentality - these games are about mentality, not tactics.
“It will be a good test to see if we are ready to play against Madrid."
Guardiola says as a young boy growing up in Catalonia, he loved watching FA Cup finals and believes the tradition of the famous trophy is something to behold.
“The cup in Spain is interesting, especially the final. But I think it's because there are more than a hundred teams in the FA Cup [that makes it special]," he said.
“It's one game, not two legs. It's special.
“In England, tradition and innovation is part of your culture. The FA Cup is great.
“It's a pity we cannot play with fans but we are finishing the Premier League, we are able to play in the FA Cup...it's not perfect but it's good enough.
“In England, my first memories of English football are FA Cup finals.
“I remember in Spain we can always see the final, the tradition, everything. It is so nice.
“We are looking forward to it and we are so excited to travel to London and play the game."