Former Chelsea midfielder Oscar is stable in hospital after falling unconscious during training at Sao Paulo.The Brazilian, who made 203 appearances for the Blues, suffered a cardiac issue during pre-season tests on Tuesday.Oscar was rushed to hospital after falling unconsciousGettyA club statement said: “During tests carried out on Tuesday morning (11), at SuperCT, as part of the preparation for the 2026 pre-season, athlete Oscar presented an incident with cardiological changes, being promptly attended to by the club’s professionals and the medical team from Einstein Hospital Israelita, who were present at the site.“The player was then taken to the hospital, where he is currently in stable condition and remains under observation for further tests to clarify the diagnosis.“As per standard procedure and respecting the player’s privacy, new information will be released as soon as there is an update from the medical team, in agreement with Oscar.”Brazilian news outlet Globo have reported that Oscar was on an exercise bike for an interval test.He is said to have fallen to the ground, and was unconscious for around two minutes before being assisted by medical staff.Doctors later conducted a diagnostic catheterization on Oscar to assess his condition.As per the report, the 34-year-old is evaluating a termination of his contract at Sao Paulo, and there is a ‘high’ chance this happens again.In August, a medical evaluation on a fractured vertebrae highlighted an abnormality, but Oscar was allowed to continue playing.Oscar reportedly told people close to him at the time that if there was a chance he fell unwell on the pitch, he would stop playing.It remains to be seen when he will be discharged from hospital.Oscar won four major trophies during his spell at ChelseaGettyOscar’s success at Chelsea and beyondChelsea signed Oscar from SC Internacional for around £25million in 2012, with the then 20-year-old prospect signing a five-year deal.He made his first Blues start in a Champions League group match at home to Juventus and scored two stunning goals.Oscar won the Europa League in his debut season and then the League Cup in 2015, as well as two Premier League titles.The skilful Brazilian netted 38 goals and assisted 31 others across his five years at Chelsea before a lucrative move to China in 2017.Oscar signed for Shanghai Port, agreeing a deal that saw him earn a reported £400,000-a-week.He was one of many talents from European clubs to make the move to China as they offered huge salaries.Oscar earned a huge move to China after five years in the Premier LeagueGetty“China has incredible financial power and sometimes makes offers that players can’t refuse,” he said in an interview with The Guardian.Oscar won three Chinese Super League titles with Shanghai Port, as well as the Chinese FA Cup and Chinese FA Super Cup.The 48-capped Brazil international bagged a stunning 77 goals and 142 assists across 248 appearances for the club.Oscar left and completed a return to Sao Paulo at the beginning of the year, having previously progressed through their academy.He has made 21 appearances for them in 2025, but hasn’t played since July due to vertebrae and calf injuries.