When Al Horford’s signing with the Golden State Warriors in free agency was officially announced over the weekend, it marked the end of his tenure with the Boston Celtics. Big Al helped build the foundation for Banner 18 🏆 pic.twitter.com/HF98lzhcB4 — Boston Celtics (@celtics) October 1, 2025 Expand TweetWith the Celtics opting to redirect their focus this offseason in the wake of Jayson Tatum’s injury in the playoffs, Al Horford’s signing with another team, such as the Warriors, was inevitable. Article Continues BelowWith Horford officially in the fold, he is expected to slot in as the Warriors’ starting center alongside Draymond Green in the frontcourt. 3 overall pick in the 2007 NBA Draft by the Atlanta Hawks, Horford played nine seasons for the Hawks before he began his first stint with the Celtics from 2016-2019. Prior to rejoining the Celtics, Horford played briefly for the Philadelphia 76ers and Oklahoma City Thunder.