Considered to be a highly talented and promising player in his youth, Oscar has drawn comparisons to players such as Mesut Özil and former Brazilian teammate Kaká due to his playmaking abilities. A quick, agile, and technically gifted player, with superb dribbling skills and an excellent first touch, Oscar is very fluid and creative in his runs. As an offensive playmaker, Oscar has great vision and is able to deliver precise short passes to his teammates, which enables him to play "killer balls". Oscar is also extremely effective in building up play in areas higher up the pitch. His cunning runs, as well as his skills, range of passing and finishing ability, make him a threat inside or near the opposing penalty area, and allow him to score goals in addition to creating goalscoring opportunities. Although he typically played either as a second striker or in a central attacking midfield position for Internacional, since his transfer to Chelsea, Oscar has been deployed in all three attacking midfield positions behind the central striker, in the centre as well as on either flank. Known for his vision, ability to pick out teammates in tight positions, and carve out chances in difficult situations, Oscar often acted as the catalyst in Chelsea's attacks during his time with the club, and was widely praised for his role in the team's Europa League success in 2013. Under Mourinho, Oscar was used as Chelsea's primary playmaker in midfield. A versatile player, he has also been praised by managers for being capable of playing in wider positions, as well as in his favoured role in the centre of the pitch. Oscar's energy, work-rate, tenacity, and ability to press opponents high up the pitch made him a favorite of his former Chelsea manager Mourinho, and also allowed him to play in deeper midfield positions, or even in a box-to-box role on occasion, in particular during his time with São Paulo and under his former Chelsea manager Antonio Conte. Despite his talent, however, he has accused by certain pundits – such as Nizaar Kinsella of Goal.com – of being inconsistent, and of failing to live up to his potential, in particular during his later Chelsea career, where he struggled to adapt to different systems and retain his place in the team's starting line-up.

From English Wikipedia, CC BY-SA