The Celtics are facing far lower expectations this season after losing several key players from their championship core this summer via trades and free agency, along with the loss of Jayson Tatum to an Achilles tear. Boston is no longer considered a contender in the East due to those developments, but that isn’t impacting the team’s mindset in training camp. According to assistant coach Sam Cassell, Joe Mazzulla is kicking things up a notch in a new era of Celtics basketball.

Cassell spoke to Zolak and Bertrand on 98.5 the Sports Hub on Wednesday about what he’s seen from the team so far during training camp before making a surprising declaration about what the players are facing.

“We’re going to play hard, we’re going to compete,” Cassell said. “We’re going to be the hardest pla

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