Belletti can see Coutinho staying and playing with PSG star Neymar. Neymar is being linked with a return to Barca this summer.
Coutinho's poor performances, according to Belletti, can be put down to a lack of confidence.
"His teamwork is really good in Barcelona and with the Brazilian national team," Belletti said of Coutinho.
"I see him okay. And when he gets more confidence, he will do much better."