The Manchester United captain has said it's an exciting signing for the club.
Manager Louis van Gaal has been adopting a 3-5-2 system during his tenure so far and some have suggested that fitting in Rooney and Falcao along with Robin Van Persie could be a problem for the United manager.
Rooney has proved to be a versatile player in the recent past by dropping off to the flanks and into a deeper midfield position so there is scope for his role to change.
Rooney was speaking at a press conference ahead of England's game with Norway, where he will captain the side for the first time every since being announced as the new skipper by England manager Roy Hodgson.
He said: "I don't know how it'll affect my role, it's something you'll have to ask Louis van Gaal. I think it's a fantastic signing, he's one of the best players in the world. It's a real sign of intent from Manchester United and it's an exciting time for us."
It has been a busy end to the transfer window for Manchester United with Daley Blind also completing his move to Old Trafford from Ajax, whilst Angel Di Maria completed his move to the club last week for a British record fee.
The signing adds to the wealth of attacking talent at their disposal, but Rooney's versatility could allow both Falcao and Van Persie to lead the attack.