Horford is a key member of Joe Mazzulla's roster. Not only is he a reliable presence on the court, he's also a leader in the locker room and on the bench. Nevertheless, Horford may value the opportunity to keep contending for a championship next season, which is something Boston is unable to offer.

So far this summer, the Warriors have seen one of their own longtime centers, Kevon Looney, abandon the team for the New Orleans Pelicans in free agency. It's not a great loss, as Looney proved virtually unplayable in the postseason.

NBA free agency opens at 6 p.m. Monday, but it doesn't sound like Al Horford will have an answer on his future at that point.