Ronaldo unveiled by Corinthians

Ronaldo ruptured a tendon in his left knee in February

Former Brazil striker Ronaldo has been unveiled by Sao Paulo-based outfit Corinthians as the club's new signing.

The 32-year-old, who left AC Milan last June, has fought back from a serious knee injury, making his comeback in a charity match in Morocco last month.

Revealing he might play "soon", Ronaldo also admitted he faced a "major challenge" to return to full fitness.

"I'll have to show it on the field," he said. "Off the field it is only words, but football is proven on the field."

The Brazilian has agreed a one-year contract with the club who have won promotion back to the first division.

Reports suggest the three-time world player of the year will earn a monthly salary of about £113,722.

But he said: "I'm just a player like all the rest here and I have the same rights, and the same obligations, as everyone else. I won't have any privileges."

It will be the first time Ronaldo has played for a Brazilian club since leaving Cruzeiro at the age of 17 to join PSV Eindhoven.

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"I love football - I've been a professional since I was 15. But I only played one year in Brazil. I've missed my country and family a lot," he said.

The striker spent nine months on the sidelines after rupturing a tendon in his left knee while playing for AC Milan in February.

His contract with Milan expired on 30 June and he was training with Brazilian outfit Flamengo in an effort to return to full fitness.

The former Barcelona, Real Madrid and Inter Milan striker recently turned down an offer to join Italian side Siena.

Marcio Gobbi, vice president of Corinthians, rejected accusations that the club had signed Ronaldo for marketing rather than footballing reasons.

"Ronaldo isn't here for marketing, he is here to play," he said. "Brazilian football deserves the return of the best player of recent times."