Shanghai SIPG general manager Sui Guoyang says Oscar was tempted away from Chelsea due to a lack of first team opportunities.
The Brazil international will become the latest big name star to join the Chinese Super League in January after agreeing a deal on a £60m switch to Shanghai, where he will team up with former Chelsea manager Andre Villas Boas.
“Oscar has fallen out of favour with Conte because he has no place in Chelsea‘s 3-4-3 formation,” Guoyang said.
“It played a key part in his desire to leave. He felt terrible to sit on the bench and not be involved. He is so young.
“Oscar wants to come back to the Brazil national team. Some of his compatriots play in the CSL and they still get called up to the national team. So it helped him to make the decision to move to China.”