Oscar has said he would be "delighted" if Diego Costa chose to join him in the Chinese Super League.
Brazil international Oscar moved to Shanghai SIPG in January, and Costa has since been strongly linked with China amid ongoing uncertainty over his Stamford Bridge future.
"The only thing I can tell him is that I quite enjoy my life in China. 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."
Costa has been linked with Tianjin Quanjian, with the club's owner Shu Yuhui keen to sign big names from European football.