On the eve of Celtics training camp, Al Horford officially announced he would not be returning to Boston.

The free agent big man posted a farewell message on social media Sunday afternoon, thanking Celtics fans for their support over his seven seasons with the franchise.

Moments earlier, ESPN’s Shams Charania reported Horford had “committed to a multi-year deal with the Golden State Warriors,” who were long rumored as the most likely landing spot for the 39-year-old.

“From the moment we arrived (in Boston), you have welcomed my family and I with open arms,” Horford wrote. “This chapter in my career will hold a special place in my heart. Raising Banner 18 with this city will be a moment I will always cherish. I am forever grateful for the fans and the organization. Thank you, Boston.”

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