The nine-time European champions have been frustrated in their attempts win the elusive 10th title - la Decima - having gone 12 years without adding to their record haul.
However, the Blancos take a one-goal lead to Bavaria on Tuesday for their second-leg semi-final clash with holders Bayern Munich, and Ronaldo says that nothing is more important to him than helping the club reach the milestone this season - not even the World Cup.
He told reporters: "La Decima has become an obsession, but a good obsession.
"The World Cup won't influence anything in the remainder of the season; I'm fully focused on the league and Champions League.
"We won the [Copa del Rey] and we want to win the league and the Champions League. The latter is the most difficult trophy to win."
Next week's clash at the Allianz Arena will kick off at 7.45pm.