World Cup winner Ronaldo is upbeat about his recovery from a career-threatening knee injury but does not want to rush back into action.
The striker had been expected to feature in Corinthians' Campeonato Paulista clash with La Plata on Saturday but does not want to risk further injury by hurrying his return.
"I am feeling pain but it's pleasurable because it is great to train again without any physical problems," said Ronaldo. "I have been suffering a lot in training but it is worth it.
"I am losing weight and getting stronger. But I don't know when I'm going to play as I want to be fully recovered and ready.
"The training sessions are hard but necessary. I am here because I love to play football and I have to go through this recuperation phase."
Ronaldo, 32, signed a one-year deal with Corinthians in December following his release from AC Milan, for whom he was playing when he suffered knee ligament damage last February.