Brazilian sensation, Oscar has completed a medical and been granted a work permit as he closes in on a £25million move to Chelsea.
The 20-year-old midfielder will join the European champions after the Olympics from Brazilian side Internacional.
He has been named in his national squad for the Games and is expected to play against Team GB at the Riverside in Middlesbrough on Friday.
Oscar, the rising star of South American football, has established himself at international level with six full caps and is expected to play a key role at the 2014 World Cup in his home country.
Chelsea will give him some time off after the Olympics before slotting him into a free role in Roberto Di Matteo's new system.
He is adept as a playmaker or in the role behind the striker and equally comfortable on the left or right of midfield. He is described as a 'typically brilliant Brazilian No 10'.
Oscar is also a proven goalscorer. He hit a hat-trick in last year's Under 20 World Cup final victory over Portugal and has a strike rate of a goal in every three matches for Inter.
After landing at Heathrow, Oscar had his medical in the southwest London suburb of New Malden before joining his Brazil team-mates.
His arrival brings Chelsea's spending this summer to £63.5m following the capture of Eden Hazard and Marko Marin.