The Brazilian global left Stamford Bridge for Chinese Super League outfit Shanghai back in January in a move thought to be worth around £60million.
Both the teams clashed against each other after what looked like a deliberate attempt by Oscar to fire the ball at two of his opponents.
Oscar moved to SIPG, coached by former Chelsea manager Andre Villas-Boas, for £40 million and has been one of the standout players for the Super League team.
A melee ensued with all 22 players as well as substitutes and staff members spilling on to the field of play.
Oscar was unhurt and the fiery encounter finished 1-1 to leave SIPG four points behind reigning champions Evergrande.
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The home side's Chen Zhizhao retaliated, pushing the 25-year-old Brazilian to the ground.
Oscar avoided any punishment as he was dragged away from the incident as players continued to scuffle.
Oscar's manager Andre Villas-Boas echoed his sentiments and said that the Brazil worldwide was acting in the best interests of his team.
Villas-Boas told Shanghai's official social media: "Our goal should be offside and it was unlucky for Guangzhou".
Shanghai Shenhua's Qin Sheng was hit with a six-month ban earlier this year for stomping on Belgian worldwide Axel Witsel of Tianjin Quanjian.