The favourites were beaten 2-1 on the day.
Guardiola later said: "Congratulations to them on a fantastic season."
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"We lost the game. Congratulations to United. It was a tight game.
"It can happen. Many things. At the end they scored two goals and we couldn't score more."
Asked if he thought United were the better team, he replied: "No.
"The second half we were there all the game. Manchester United are always a transition team. First half we struggled a bit but second half we were better. In general it as a good performance for a final."