A 5ft 10in (1.79m) attacking midfielder who can also play wide, he has a reputation for good pass-and-move football, protecting the ball and choosing the right moment to play passes.
He made his debut on the opening day of the 2012/13 Premier League season, coming on as a second-half substitute despite having trained just twice with his team-mates, and displayed a previously lesser known turn of pace to add to his sharp passing game.
Oscar made his first start for the club in the Champions League draw against Juventus at Stamford Bridge, announcing his arrival in style with two strikes in the space of a couple of minutes, the second of which will live long in the memory. Since then he became a regular in the side under both Roberto Di Matteo and then Rafa Benitez.
His fondness for goals of the spectacular variety continued in the home game against Shakhtar Donetsk when he produced a stunning effort to score from 35 yards, while another followed in the FA Cup at Brentford.
The Brazilian certainly stood up to the physical side of the English game during his first season at the club, and reserved some of his finest form for when it mattered most.
He headed the opening goal during 2-2 draws with Liverpool and Tottenham in quick succession, and played the full 90 minutes of the Europa League final.
Oscar finished the season having scored 12 goals.
Oscar scored our first goal of the current campaign, breaking the deadlock in a 2-0 opening-day win over Hull City, while he also netted our first Champions League goal of the season in a 2-1 home defeat against Basel.
Having come through the youth system at Sao Paulo, he graduated to the first team in 2008, the same year he was part of the Brazil side that won the Under-17 World Championships. That feat had also been achieved the previous year.
His time at Sao Paulo came to an end in December 2010 with a move to Internacional, a club based in Porto Alegre in the very south of the country. In 2011 and 2012 they won the local state championship and Internacional also used Oscar as a substitute in the 2010 FIFA Club World Cup, although they suffered a shock defeat by Congolese side Mazembe.
Oscar, who played international football at every level from Under-15 to Under-20, made his debut for Brazil's senior side in September 2011, coming on as a substitute in a 0-0 draw against big rivals Argentina.
He made his full debut in a win over Denmark in May 2012, and he scored his first international goal the following month, although Brazil were beaten 4-3 by Argentina in New Jersey, USA.
Oscar shone at the Under-20 World Cup in Colombia, making history when he scored a hat-trick in a 3-2 extra-time win against Portugal.
He also played a pivotal role as Brazil clinched a silver medal at the London 2012 Olympics.
Oscar was an ever-present for Brazil as they won the 2013 Confederations Cup on home soil. The youngster starred in their opening game against Japan, laying on the third goal for Jo, while also teeing up Neymar to score with a clever pass in the 3-0 final success over Spain.