The Portuguese ace has been linked with an Old Trafford return in the past few months but Real director Butragueno has made it clear that his contract situation and his love for Madrid will make it hard for Ronaldo to leave.
"Cristiano is under contract and we are very happy with him," he said.
"We are delighted he is at Madrid because he is a fantastic professional, and very ambitious in a positive way.
"His contribution to the team and the club has been amazing since he arrived.
"We are very grateful he came to us and are lucky he plays for Real Madrid."