The pair played together for eight years at the Etihad, before Toure's 2018 departure.
While Toure, 37, was quick to stress that he is delighted for his former team-mate, he appeared to question the decision not to also award him one.
The legendary midfielder said: "The statue for Silva, I am very delighted, very happy. They gave him that.
"For me, it's up to the club – I have nothing much to say about that. They can decide what they want.
"Is it odd though? Yeah. But I can do nothing about it because it is up to the club. The fans know better."