The 33-year-old's future at Camp Nou remains the subject of much speculation as his contract with the Catalan giants is due to expire in June 2021.
Manchester City continue to be credited with an interest in the Argentina international, but PSG have also been mentioned as potential suitors since Messi signalled a desire to seek pastures new.
Neymar revealed after Wednesday's Champions League win over Manchester United that he is desperate to reunite with his fellow South American "next season", while PSG midfielder Leandro Paredes has also talked up a potential switch to the French capital.
RMC Sport pundit Riolo has now insisted that the Barca attacker, who has scored seven times and registered four assists in 12 club outings this term, will join Thomas Tuchel's side next summer.
"Lionel Messi will be at PSG next year. I am being very serious. Messi will be at PSG next year," said the journalist.