According to Brazilian newspaper Estadao, Neymar has told Coutinho that “he would not regret Liverpool’s decision to keep him away from Barcelona”.
Coutinho is believed to be desperate to move to Camp Nou after handing in a transfer request earlier this month.
So far, Liverpool have held firm in their stance that the 25-year-old is not for sale having rejected three bids, the most recent of which is believed to be around £138m.
Neymar’s relationship with Barcelona has soured since his world-record £198m move to Paris Saint-Germain amid accusations from the Catalan club that the attacker breached his contract.
The pair are currently together preparing for this week’s World Cup qualifier against Ecuador.