Discussing the launch of Real's Champions League campaign, Ronaldo declared the Spanish Liga wouldn't be his long-term home.
"The Champions League is the best competition out there and everyone wants to win it as it's the most difficult of all," he said.
"This year will be as complicated as ever but we will fight to win it with all our might. After that, we will see what happens.
"I am still not finished in the world of football. I am Portuguese and I love my land and people but I am not sure if I will finish my career there.
"I never close the doors to any league or any club but for now I am happy in Madrid. In the future, you never know."