According to MassLive's Brian Robb, Horford's showing against the Cavaliers should be enough proof that he can continue playing beyond the current season. However, Horford will hit unrestricted free agency next summer, meaning the Celtics must move to sign him to an extension, assuming he's willing to push off retirement and continue playing.

The Celtics were a far better team with their 38-year-old center on the floor, challenging shots, grabbing key rebounds, and knocking down 3-pointers in the 120-117 win.