The Portuguese attacker has been linked with a move to Paris Saint-Germain of late as negotiations over a new contract at the Bernabeu drag on but Ramos feels Ronaldo is happy in the Spanish capital.
"You have to see which club has €1bn to pay what he is worth," the defender told reporters when quizzed on the French side's interest in the former Manchester United man.
"He should be in Madrid and he is happy here."
Madrid take on city-rivals Atletico in the Copa del Rey final on Friday and Ramos admits that failure to beat Diego Simeone's side would put a negative spin on the whole season.
"It would be a failure in terms of titles. There are different ways of losing. If you have to lose, it should be with the same attitude as we had against Borussia Dortmund.
"There are no favourites in the final. After the Champions League, this competition is worth a little more. Injuries? There are no excuses. You play in finals to win."
An injury to Raphael Varane means Pepe is likely to partner Ramos at centre-back but the Spaniard is happy to play with anyone.
"It's not my call. I'm not a coach. We all want to play - Pepe included. He trains with the team and the squad depends on the coach."
Jose Mourinho chose not to attend the press conference before the Atleti game but when quizzed on the matter, Ramos merely responded: "I'm not here to talk about that."
