Manchester United boss Sir Alex Ferguson claims he is unperturbed with rivals Manchester City being taken over by new owners, the Abu Dhabi United Group, who have vowed to take City to the top of the Premier League.

"I can't be worried," Ferguson told reporters after a meeting of top European coaches at UEFA's headquarters.

"We have a good set-up ourselves, we've been working for years to build the team we've got.

'There's always challenges in football, some years ago it was Chelsea, some years ago it was Arsenal, and whenever the challenges come you have to accept it, it doesn't change anything."

Doctor Sulaiman al-Fahim, the public face of the ADUG wants to see his new club reigning the Premiership and has already signalled their intent by adding Brazilian Robinho from Real Madrid for a British record breaking £32.5million to the Eastlands Stadium.