The forward misses Wembley trip as he serves a two-match suspension for swearing into a TV camera and admits he is disappointed not to be featuring in the match.
Rooney misses the Wembley tie as he is serving a two-match ban following an abusive outburst in United's win at Upton Park and although he apologized for his actions he must now accept his fate and watch his team-mates try and secure a final spot.
"As most footballers will tell you, it's probably more nerve-racking watching a game than it is playing in it," he said.
"It's always disappointing when you don't play in games, especially such a big one as it is on Saturday.
"But I believe we have got a good chance of winning and I am hoping the boys can pull through and get us to the final."
Rooney, who has never won the FA Cup before, went on to hail Ryan Giggs and admitted he an idol to the rest of the Red Devils' squad.
"You see Giggs winning games for us at his age," he added. "It shows why he is such a big idol for us all in the dressing room, especially the younger players, who can see how he handles himself.
"We all hope that when we come to the end of our careers we can have nearly as much success as him."
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