WEGGIS, Switzerland, May 24 - Ronaldo is ready to suffer to regain match fitness in time for the World Cup.

Brazil coach Carlos Alberto Parreira plans to field Ronaldo in the world champions' opening match against Croatia on June 13, even though the striker has not played a game since early April.

Ronaldo, plagued by minor injuries all season at Real Madrid, trained with the rest of the Brazil team on Wednesday afternoon without feeling any ill-effects.

"One week will be enough for me to reach the same (fitness) level as the others," Ronaldo told reporters before going on to the field.

"I feel fine, I'm starting some physical work which is going to be tough but which is fundamental in preparing for the first game.

"The training sessions will be tough but it's the moment to suffer and to withstand it."

Ronaldo's last game was on April 8 against Real Sociedad when he scored before limping off with a injury to the back of his right thigh.

"It's always nice to be with Brazil, I know perfectly well what it means to represent Brazil," he said.

"I've been out of action for a month and a half and this is a pre-season for me.

"I still haven't seen what they've planned for me but I'm motivated, I want to train and do my best to be prepared for the World Cup."