The defender, 34, is off contract at the end of the season and yet to hear from management about a new deal.
Courtois told El Larguero: "He is very important for us and all the Madridistas want this to continue.
"I admired Ramos a lot, except once in Lisbon (Champions League final 2014). I always tell him that we have to win a Champions League together.
"It's an honour to play with him."