Emotional Ronaldo confirms retirement
The tearful Corinthians striker announced his decision at a press conference in Sao Paulo. "I'm stopping my career as a professional footballer," he said, his voice breaking. "It's been a beautiful, emotional, marvellous career.
"These last two years, I've had a long series of injuries, from one side to the other, one leg to the other, one muscle to the other. The pain pushed me to think about the end of my career."
Having earlier indicated that he hoped to play on until the end of the year, injuries and Corinthians' early elimination from the Copa Libertadores prompted him to bring forward his retirement.
He won the FIFA World Cup with Brazil in 2002 and became the leading scorer in FIFA World Cup tournaments when he scored his 15th goal at the 2006 tournament in Germany. He was twice named European Footballer of the Year, in 1997 and 2002, and finished his international career with 62 goals in 97 appearances.
Widely regarded as one of the greatest players of all time, El Fenomeno (The Phenomenon) won the FIFA World Cup with Brazil for the first time in 1994, though on that occasion the 17-year-old was part of the squad and did not play.
In 1998, he was among the losing finalists, beaten 3-0 at Stade de France by a rampant French side that included the inspirational Zinedine Zidane. Brazil's star striker suffered a convulsive fit on the eve of the match and was removed from the starting line-up.
In a dramatic changing-room re-shuffle, he was reinstated just before kick-off but was a shadow of the intimidating forward who had scored four goals in the run-up to the final.
Makes history at the FIFA World Cup
But the 2002 tournament was where he made history. Shrugging off injury in the tournament, which was hosted by Japan and Korea Republic, he played a key role in helping Brazil to the trophy, scoring both goals in his country's 2-0 win over Germany in the final in Yokohoma.
At the 2006 FIFA World Cup in Germany he took his FIFA World Cup tally to 15 goals, surpassing the previous record held by Gerd Muller by one goal. Ronaldo, who began his career with Cruzeiro, had to fight back from three career-threatening knee injuries over the course of his career.
He was sidelined while playing for Inter by a knee injury in 1999 only to damage the same knee in his comeback for the club in February 2000, effectively keeping him out of action until March 2002. In February 2008 he ruptured a tendon in his right knee playing for AC Milan against Livorno, an injury that ended his career in Europe.