United's record signing has cut a lonely figure since being left out of the squad for the Champions League final defeat to Barcelona in 2010.
"I do not need to herald the abilities of Dimitar Berbatov, he is a fantastic talent," said Ferguson.
"Last season he didn't quite get the amount of football he wants. At his age, it was difficult for him to accept his position in the forward line. He had Rooney, Welbeck and Hernandez in front of him, and they are all young men.
"The boy has a future, but if he wants to leave it is a different matter. I am easy about it if he stays. I would be happy with that. But if someone comes in and Dimitar wants to leave, we will assess it."