Portugal coach Carlos Queiroz has backed Dimitar Berbatov for great success at Manchester United.

"In many ways he is like a typical, authentic striker in the penalty area," Sir Alex Ferguson's former assistant manager told the Daily Mail.

"He is a killer. I am convinced he will be a success at Manchester United.

"I think he is United's new (Ruud) Van Nistelrooy and if he comes into his own, it is feasible that the team can improve on last season.

"I think Alex will play Cristiano Ronaldo, Carlos Tevez, Wayne Rooney and Dimitar Berbatov all in the same team.

"And if this system functions as he hopes, it will make Manchester United's the most dangerous attack in all the world."