Douglas Costa does not know where Neymar will be next season but trusts his Brazil team-mate will make the right call on his future.
Neymar became the world's most expensive player when he joined Paris Saint-Germain in a €222 million (£195m/$260m) deal in 2017, but he has not been able to improve the Ligue 1 club's fortunes in the Champions League.
The former Barcelona forward is now reportedly available, with the Catalan giants and Real Madrid said to be interested in taking him back to Spain.