The Boston Celtics have lost a key member of their roster as center Al Horford has agreed to join the Golden State Warriors in free agency.

ESPN's Shams Charania was first to report that Horford and Golden State had agreed to a multi-year deal on Sunday. Horford turned 39 years old on June 3, but has shown in recent years that he can still contribute at a high level.

With Jayson Tatum out for a lengthy period of time after undergoing surgery for a ruptured Achilles , and Jaylen Brown recovering from an offseason procedure on his knee, the Celtics head into the upcoming season with plenty of question marks that likely factored into Horford's decision to leave Boston.

During his 18-year career, Horford has averaged 12.9 points and 7.9 rebounds per game. He spent the first

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