It was reported earlier this month that Ronaldo wanted to leave Real Madrid after feeling victimised following accusations over an alleged tax evasion worth £13million.
The 32-year-old is reportedly eager to depart Madrid this summer amid allegations from the Spanish tax authorities of fraud.
"Yes, he is under contract", Karembeu said.
However, Ronaldo has not commented on the issue and Karembau believes he won't leave Santiago Bernabeu. I believe that on the pitch we always need Karim, Cristiano, Bale - all of them - because they have won things together, although "Zizou" has the final call. I think Cristiano will stay and they will find a solution.More news: Bucks' Brogdon NBA All-Rookie team
"I have been lucky enough to see that close to waters and I have taken things from that and tried to learn from it." said the former Premier League and Champions League victor. "He belongs to Real Madrid and I think he knows that".
James Rodriguez has not been a first-choice selection under Zinedine Zidane at Real Madrid.
The France starlet is concerned he will not be given enough game time in Madrid but Florentino Perez has moved to reassure him how significant a role he would play at the club.
Karembeu, a World Cup victor and European champion with France, spent three seasons at Real and won the Champions League on two occasions - in 1998 and 2000. Should a deal be worked out between Man U and Real for the 25 year old, it could be an English adventure for the ex Monaco man.More news: Debenhams Plc (DEB) Given Average Rating of "Hold" by Analysts
Real Madrid's Álvaro Morata is very close to signing for Manchester United, with talks now back underway after being put on hold for the striker's recent wedding.
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