Ronaldo made his 13th goal in just six games with a treble, as Real Madrid beat Athletic Bilbao 5-0 in La Liga on Sunday.
Butragueno, who scored 123 league goals for Real Madrid himself, called Ronaldo's latest performance "amazing."
He told AS, as translated by Football Espana: “We’re tired of being surprised by him. He’s amazing. He’s scored three goals but could have had six. Ronaldo is a world star but behaves like a rookie with his professionalism and dedication. He’s an example.”
It was the 22nd Liga hat-trick of Ronaldo's career, which equals the league's record.
According to Eurosport, Ronaldo will score 80 goals in La Liga this season if he continues scoring at a rate of 2.167 goals per game.
Cristiano Ronaldo is good. Very, very, very good. pic.twitter.com/YRTOeaVYEy— Bleacher Report UK (@br_uk) October 5, 2014