The story involves a meeting with former Mallorca boss Luis Aragones, former president Mateu Alemany and former Barcelona footballing director Txiki Begiristain.
Marca quote Eto'o's interview with Cadena Ser in which he said, "That meeting in Luis' office... He said to me: 'Do you want to be a good player or a great player? I think that your time at Mallorca has come to an end and now you must go to fight with those that are at your level."
Eto'o continued, "I looked at him and said, 'What is this grandad saying?' and he got out his phone, called Txiki and told him: 'Do you want to win in the next few years? Well there's a player that you have to sign because he'll make you win."
Revealing the shock he had on hearing Aragones' words, Eto'o said, "When he heard my name there was like a pause and Txiki was asking, 'But is this guy smoking something?' But Jan didn't stop passing on the grandad's advice, he knew a lot, and I'm very happy."
After announcing his retirement from football, many named Eto'o as Barcelona's greatest ever No.9. He said, "It's a great honour, seeing all the great names that have been at the club, like Ronaldo [Nazario], El Fenomeno, who, for me, is the best player of all time alongside [Lionel] Messi."