Cote d’Ivoire defender
Yaya has found himself alienated from the first team by City manager Pep Guardiola this season.
The veteran midfielder has only played one game as Guardiola wants an apology from his agent for comments he has made about him and the club.
Speaking to French radio station , Kolo who plays for Celtic in Scotland has advised his brother to join Marseille.
“He (Yaya) still has talent and some things to prove,' Kolo said.
“Of course it's difficult at City at the moment. We've all been through that. We're at the top and at some point you go down.
“He has to understand that and maybe go somewhere where people want you.
“I haven't talked to him about that [Marseille]. He's still at City, I respect that. But OM is a great club. He knows the French championship well.
“It could be a great club for him.”
Yaya who won two Premier League titles, the FA Cup and two League Cups hasapologised to Guardiola and Manchester Cityon behalf his agent, Dimitri Seluk.