Originally Posted by Mimi-chan
I don't think that Matsumoto has bankai. If she had we would already seen it like Ikaku's. But what about Hisagi that might be the probability, we don't know him well and just recent time ago saw his shikai, so yeah he might have a bankai.
Well, Halibel mentioned Matsumoto power as captain level in the anime, so it could be true.