Liverpool hero Didi Hamann has questioned Alexis Sanchez's value at Manchester United.

Hamann isn't convinced the Chilean will have the same impact on the Red Devils as he had on Arsenal.

"I'm not sure whether he has got the impact he had got three years ago," said the Champions League winner.

"I think he's in his late twenties now, he is a very physical player, you have to see how long he can play at a very good level or the top level.

"And I'm just not sure whether he is the same player that he was when he first came to Arsenal."