Despite his advancing years, Berbatov feels he could still be a useful signing for the Reds.
Speaking to Betfair, Berbatov argued he could be a similar sort of player to Silva should United sign him.
Berbatov said: "There has been a lot of speculation about the future of Sergio Ramos, according to reports both the player and club are yet to come to an agreement on a new contract.
"With Ramos 34-years-old, they are probably fighting over a one year or two-year contract.
"Thiago Silva, who is even older at 36 years-old has proven that it is never too late to move to the Premier League and so far it is working out well for the Brazilian.
"I'm sure if Ramos wanted to move to a club like United then it would work out well for him too. He's in great shape, he's still a world-class defender and in my opinion there's still a lot of football left in him.
"I see him as a Real Madrid player, however, and I think player and club will find a solution and he will stay.
"I'll be surprised if he leaves, but if things don't work out then I'm sure a lot of clubs will be interested in him."