The Real Madrid official has been impressed with the 27-year-old's impact at the club and stated that Portugal fans can only be proud of the attacker's credentials
The Portugal international scored 46 Liga goals last season to inspire Los Blancos to their first league title since 2008, and the former striker was lost for words about the 27-year-old's influence on the team.
"Scoring 46 goals in 38 matches is to score more than one goal per match," he told reporters.
"We are getting more and more used to such stats, but only those who played football know how hard it is to score one goal every three matches.
"To average one goal per match is just incredible."
Yet, Ronaldo has been the target of criticism from a section of Portugal fans, as the former Sporting Lisbon prodigy has not been able to replicate his impressive club form in the Seleccao.
"The Portuguese fans must be proud of Cristiano Ronaldo," Butragueno added. "In addition to his football skills, he is an exemplary professional."