Falcao arrival excites Rooney
United shocked the football world on deadline day by completing the signing of the much-vaunted Colombian on a season-long loan deal.
Louis van Gaal's side have the option to make Falcao's move from Monaco permanent, with the addition giving the United boss a mouth-watering array of attacking talent to choose from.
It raises questions as to how United will utilise the striker - a subject Rooney was not keen to talk about, preferring to focus on the impact the signing will have at Old Trafford.
"I obviously don't know how it could affect my role, that is something you'd have to ask Louis van Gaal," the England stiker said
"But I think is a fantastic signing, he is one of the best players in the world.
"It is a real sign of intent from Manchester United and an exciting signing for us."
United had to have an extension past the 2300 deadline to ensure the necessary documents were correctly filed with the Premier League, with the Falcao deal eventually announced at 0130.
The deal took their summer spending past the £150million mark, although that has been offset in part by some summer departures.
Danny Welbeck was among those leaving, breaking away from England duty on deadline day to complete a £16million switch to Arsenal.
"Obviously time will tell (if he prospers at Arsenal)," Rooney told BBC Radio Five Live of his England team-mate. "It is obviously a good move for Danny.
"It was difficult because he wasn't playing all of the time at Manchester United, so he had to make a decision and he has obviously chosen to leave.
"We will miss him in our dressing room. He is a great friend of mine, he was great around the dressing room, so we will miss him, but I wish him all the best."