SAO PAULO — Brazilian midfielder Oscar has retired from professional football at age 34 after being diagnosed with a heart condition while at São Paulo FC. Oscar canceled his São Paulo contract, which had two years remaining, ending a career that spanned more than a decade across three countries.

Oscar was treated in hospital in November after he became unwell during physical testing at São Paulo's training centre. He experienced vasovagal syncope, a common type of fainting caused by a sudden drop in blood pressure and heart rate. The episode led to the diagnosis that ended his career.

"I wanted to do more for Sao Paulo, I wanted to play more. I think I had both the footballing ability and the age to play more, but unfortunately this happened." Oscar said. "Now I'm going to retire and continue supporting Sao Paulo, continuing my life as a fan. I'm ending my career here at Sao Paulo, a career that has taken me to many places, practically all over the world."

Oscar started his career at São Paulo before signing for Chelsea in July 2012. He played as a midfielder for both Chelsea and the Brazil national team, earning 48 caps for his country.

During his time at Chelsea, Oscar scored 38 goals in 203 games. He won the Europa League in his first season at the London club and was part of the squad that won a Premier League and League Cup double in the 2014-15 season. Chelsea sealed another Premier League title in May 2017.

Oscar departed for Chinese Super League side Shanghai Port in January 2017. He won three Chinese Super League titles with the club during his years in China.

He returned to São Paulo on a three-year deal in January 2025, completing a homecoming to the club where his professional career began.