The Celtics had all of their non-Jayson Tatum players available for Wednesday night’s season opener.

Jaylen Brown, Boston’s leading man in Tatum’s absence, was upgraded from questionable to active before tipoff against the Philadelphia 76ers at TD Garden.

Celtics head coach Joe Mazzulla said pregame that Brown needed to go through his warmup before determining whether he’d be able to suit up. The four-time All-Star wing has been dealing with a left hamstring strain that he suffered in last Wednesday’s preseason finale, but he was able to fully participate in practice Monday and Tuesday.

Brown will be a vital player as the Celtics look to withstand the loss of Tatum, who’s set to miss at least the first several months of the season as he recovers from Achilles surgery. Brown also is look

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