Costa received offers from clubs in the Chinese Super League in January.
And clubs from the Fat East are expected to register their interest in the 28-year-old striker at the end of the season.
Oscar left Chelsea earlier this year and joined Shanghai SIPG in a deal worth around £60million.
And the Brazilian has urged to Costa to follow him.
“It’s hard for me to give specific advice to Costa. The only thing I can tell him is that I quite enjoy my life in China,” Oscar told CCTV-5.
“I don’t have any problems so far.
“The culture here is obviously very different from that of my country, but we are getting used to it, bit by bit.
“Everyone has got to figure out the things he wants most. And I believe coming to China is the best choice for me.
“If Costa moves here, I will be delighted. He is pursuing happiness and I hope everyone has a happy life.”