The Boston Celtics lost plenty of talent this offseason. But they have a plan to make up for it.

The Celtics held their first training camp practice Tuesday with an overhauled roster that lost four key members of its championship core -- Jrue Holiday, Kristaps Porzingis, Al Horford and Luke Kornet -- and will be without star player Jayson Tatum for most (or potentially all) of the 2025-26 season .

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And to hear assistant coach Sam Cassell tell it, head coach Joe Mazzulla welcomed Boston's newcomers by putting them to work.

"We want be the hardest-playing team in basketball, and that's how our camp is going right now," Cassell told 98.5 The Sports Hub's Zolak & Bertrand on Wednesday.

"We're having a hard train

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