With Horford in Golden State, the Celtics will have to rely on newly acquired centers Chris Boucher and Luka Garza, plus incumbent Neemias Queta, to man that spot next year. It's unclear at this point which one will start.

In a recent report from NBA insider Jake Fischer, he noted that the Celtics are still looking to find a new home for Simons, who they acquired in the Holiday trade in late June. While Simons is an electric scoring guard who could certainly give Boston a boost, his $27.7 million price tag for next season might be more than Boston wants to keep.