Ronaldo responded to last week's boo-boys at Real with a hat-trick in victory over Sevilla.
Lass said: "Cristiano Ronaldo has proven in every game that he's capable of scoring more than 40 goals this season. Nevertheless, the most important thing for him, and for all of us, is to win titles. We'll naturally help him score goals whenever we can. Everybody knows who Cristiano Ronaldo is: one of the best players in the world."