Messi's future has come under fresh scrutiny after Neymar declared he wanted the Argentine at the club next season.
"What I want most of all is to play with Messi again, to be able to enjoy him once again on the pitch," Neymar told ESPN after PSG's win over Manchester United.
"He can play in my place, I have no problem with that.
"But I want to play with him next year, for sure. We have to do it next season."
Lionel Messi could leave Barcelona at the end of the season (Image: GETTY)
Messi came close to leaving the Nou Camp in the summer but he retracted his transfer request to leave amid fears over a legal battle.
The 33-year-old's contract with Barcelona ends in 2021 and next month he can hold talks with interested clubs about a move.
PSG are likely to be among the frontrunners for Messi, in what would be a reunion with Neymar after they played together at Barcelona from 2013-2017.
And Riolo confidently said on RMC Sport: "Lionel Messi will be at PSG next year.
Neymar and Lionel Messi together in 2014 (Image: GETTY)
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