Osasuna goalkeeper Sergio Herrera says Vinicius Jr hurts his image amongst his fellow pros with his antics.
Osasuna face Vini Jr and Real Madrid this weekend.
Herrera said: "As a footballer, words are unnecessary because he is an incredible player.
"Taking away the time he has been out due to injuries, he is at a high level. And well, then it is true that there is a lot of talk about him at an extra-sports level, about his relationship with fans or with different players.
"He often tarnishes his games with gestures and attitudes. I encourage him to improve that."