Roberto Carlos has warned Chelsea that Samuel Eto’o has changed for the worse late in his career.
The legendary Brazilian worked with Eto’o first as a team-mate, and then as manager, at Anzhi Makhachkala.
He says that the Cameroon icon made things uncomfortable for the Russian team with his outsize personality.
According to Roberto Carlos, Eto’o’s ostentatious salary was a cause of friction among the other players at Anzhi.
And things became particularly prickly between himself and Eto’o when the striker attempted to influence team selection and tactics.
"I've known Eto'o since he was 16. He's a good person and I've always liked him, but he always thinks of himself, not the group, which can be really damaging, " Roberto Carlos told Globoesporte.
"It's quite confusing and odd when a footballer, instead of playing, is interested in bringing in players who are his friends. He did everything at Anzhi, except play football.
"Because of the values involved [of Eto’o’s massive salary at Anzhi], there were a few small problems in the dressing room with the arrival of Eto'o, which were resolved. His signing had to be explained to several players.
"Then there came a point when Samuel wanted to interfere in my work. He wanted to control the club, taking my place and that of the coach, Guus Hiddink.
“We talked about one thing, and then he went to the players and talked about another. That stressed me out and I warned that I would pack my bags and go."
In a sense, Roberto Carlos has accused his old friend Eto’o of growing too big for his boots.
And it will now be interesting to see if the African superstar’s ego can be held in check during the new chapter of his career at Stamford Bridge.