The United boss said: “Rooney was out of this world. He scored twice and ran the game.
“His aggression and determination was brilliant. Ronaldo was again superb.
“I’m pleased to be going to the first final at the new Wembley. I told Ronaldo and some of the other players they’ll understand how great it is when we get there.
“It was the perfect win to end a wonderful week. Watford are the type of team that can frustrate you, but we passed the test.”