Former Chelsea midfielder Oscar is reportedly set to retire after collapsing during a training-ground exercise test with Sao Paulo and later being diagnosed with vasovagal syncope, a condition affecting heart rate and blood pressure. The 34-year-old, who returned to his boyhood club last December, has now informed Sao Paulo of his intention to end his career following the frightening incident.Oscar was hospitalised after collapsing while using an exercise bike during an interval test at Sao Paulo’s training facility, prompting immediate admission to the ICU for monitoring. Subsequent examinations confirmed he had suffered vasovagal syncope, a condition that causes a sudden drop in heart rate and blood pressure. Following discussions with the club, Oscar has now expressed his desire to retire, as reported by Brazilian outlet Globo, with a formal announcement expected soon.The shock news brings a dramatic halt to a career that began at Sao Paulo, peaked at Chelsea, and saw an unexpected rebirth in China before his emotional return to Brazil last year. His comeback season had already been disrupted by a fractured vertebra, during which early signs of a potential heart issue were reportedly detected. This latest episode has underlined the long-term health risks involved, leading the midfielder to prioritise personal wellbeing over continuing his professional journey. Oscar wrote on Instagram, "Everything will be alright, God willing,” to reassure his followers following his hospital admission.Oscar had joined Sao Paulo last December on a three-year deal after nearly eight years in China, where he became one of the league’s standout performers both statistically and in silverware. Earlier in his career, he made 203 appearances for Chelsea, scoring 38 goals, winning two Premier League titles, the Europa League and the League Cup before completing a record transfer to Shanghai in 2017. His time in China saw him collect major trophies and amass substantial earnings, but his return to Brazil has unexpectedly ended on medical grounds rather than sporting terms.Add GOAL.com as a preferred source on Google to see more of our reportingSao Paulo are now expected to collaborate with Oscar and his medical team to finalise the formal retirement announcement and outline the next steps in his transition away from the pitch. The player, who reassured supporters following his hospitalisation, will likely focus on recovery and long-term health management as he adjusts to life after football.