The Boston Celtics have signed guard Derrick White to a four-year, $125.9 million contract extension. The deal, reported by ESPN, includes a player option and was a significant offseason priority for the reigning NBA champions. White has made an All-Defensive Team in each of his two full seasons with Boston, solidifying his value to the team. The extension breakdown includes $28.1 million for the 2025/26 season, $30.4 million for 2026/27, $32.6 million for 2027/28, and $34.8 million for 2028/29. The $125.9 million was the maximum allowed. Assuming Jayson Tatum signs a supermax extension, the Celtics are already facing a minimum luxury tax bill of $125 million in 2025-26. This move is part of the Celtics' strategy to retain key players who contributed to their championship success.