Pochettino is being linked with Bayern Munich.
But Riolo told RMC: "If it does not go well with (Thomas) Tuchel this year and if there is no progression, clearly Pochettino will become a candidate for PSG.
"Because in addition, it is clearly one of his ambitions and he has always wanted to return to PSG, that he has said and repeated several times. After, at the end of next season, there is also Bayern. Juventus absolutely wanted him last year, but they took Maurizio Sarri, but it's not impossible that it does not go very well with him.
"I do not know if he will be completely compatible with Juve, especially if with (Cristiano) Ronaldo he goes away. Pochettino will have the front doors because there are two, three clubs where he can move."