Sam Hauser of the Celtics shoots over Cleveland’s Evan Mobley during Game 2 of the Eastern Conference semifinals this past season. Hauser has agreed to a four-year contract extension through the 2028-29 season. Steven Senne/Associated Press The Boston Celtics are keeping another rotation player from their NBA championship team for an extended period, agreeing to a four-year, $45 million contract extension with Sam Hauser, a league source confirmed to MassLive.

The move was first reported by ESPN’s Adrian Wojnarowski. The Celtics have been aggressive this summer, locking down their core from the 2024 title team. They already had exercised their option on Hauser for 2024-25, but now he joins Jayson Tatum and Derrick White with long-term contract extensions this summer.

Jaylen Brown, Jrue Holiday, Kristaps Porzingis and Peyton Pritchard already had long-term deals. Al Horford, 38, is the only rotation player not under a multi-year contract. Hauser is coming off a career-best season in which he played 79 games (13 starts), averaging 9.

0 points and 3.5 rebounds in 22.0 minutes per game.

Notably, the sharpshooter knocked down 42.4% of his 3-pointers on 5.9 attempts per game.

Between the salary cap, luxury tax and Collective Bargaining Agreement, the Celtics’ roster is going to cost the team a lot of money down the line. As of now, the projected payroll for the 2025-26 season is roughly $225 million, which would come with a historic $210 million luxury tax bill. CAVALIERS: Cav.