The Brazilian is enjoying life at Shanghai SIPG, and he would be happy if his former Chelsea team-mate joined him in the CSL
Shanghai SIPG star Oscar would be "delighted" if former Chelsea team-mate Diego Costa joined him in China.
Costa, 28, is widely expected to make a move from the Premier League champions in the off-season, having been heavily linked to Chinese Super League (CSL) side Tianjin Quanjian.
Oscar, who made the move to Shanghai in January, said he would be thrilled to see Spain international Costa join him in China.
"It's hard for me to give specific advice to Costa.