Speculation continues to suggest that the world's costliest player could be involved in another mega-money move this summer.
Manchester United are said to be keen on bringing a former Old Trafford favourite back to the Premier League, while ambitious French outfit Paris St Germain are also rumoured to be in the process of piecing together an enticing transfer package.
Real are understandably keen to play down the rumours, with Ronaldo having been a revelation during his four years at Santiago Bernabeu.
He does have just two more years left to run on his contract in the Spanish capital, which has helped to keep the gossip flowing, but Perez is convinced that the Portugal international will eventually pen an extension and commit himself to Real for the remainder of his career.
He told 20minutos: "He's our most important asset, and we will build the future of Madrid around him.
"Soon we will clarify this issue. I have no doubt that Cristiano is going to retire at Real Madrid. I'm convinced that he'll renew. The renewals are done before the season starts."
Perez has also been speaking about possible additions at the Bernabeu, with Real reported to be plotting summer raids for Tottenham Hotspur forward Gareth Bale, Napoli striker Edinson Cavani and Malaga playmaker Isco.
He added: "I try to make it that the best players in the world play for Madrid.
"Players are never expensive or cheap. It depends on the performances that they provide. (Luis) Figo, (Zinedine) Zidane, Ronaldo and (David) Beckham gave us a massive jump in income. If you invest in great players, you will have more income.
"That allows, firstly, the club to be independent and in the hands of the members, and, secondly, to attract other great players.
"We want great footballers who work hard and understand this club and its history. Those that know me, know I always want the best to come to Madrid."