The Brazil legend has backed his compatriot to become a legend of the game providing he can overcome his recent dip in form on the pitch.
Neymar has failed to score for Barcelona since mid-February as his form has suffered following the controversy surrounding the details of his move to Camp Nou.
Barca president Sandro Rosell resigned after it was revealed the forward's father was paid 42 million euro as part of the deal that saw him move to the club from Santos last summer.
Romario has taken to Twitter to offer is support and insists the youngster's recent struggles on the pitch are nothing more than a minor blip suffered by even the greatest of players.
"In my opinion, every player has good and bad phases, it's not only the case with Neymar. I would give him this advice: have attitude and always leave personal problems off the field," he said.
The 48-year-old, who scored more than 300 goals in nearly 450 appearances in his professional career, has also called on the 22-year-old to learn from his Blaugrana teammate Lionel Messi.
"Currently, he plays alongside one of the world's best [Lionel Messi] and can learn a lot from him. I was "the Messi" of my era, other players would have liked to have learnt from me," he said. "I'm sure Neymar will go much further in his career and he'll give joys to the Brazilian fans."