The Celtics have been preparing to enter this season without Jayson Tatum.

Now, the status of his longtime co-star is up in the air.

Jaylen Brown, Boston’s clear-cut No. 1 option while Tatum recovers from Achilles surgery, exited Wednesday night’s preseason finale at TD Garden with what the team called left hamstring tightness.

Brown suffered the injury midway through the first quarter. Roughly a minute after falling awkwardly on a drive to the basket, he grabbed at his hamstring, called for a sub and walked off toward the locker room. The Celtics announced Brown was doubtful to return, and he did not, finishing with seven points, two rebounds and one steal in seven minutes.

Derrick White stuffed the stat sheet in Brown’s absence, Neemias Queta played his best game of the preseason, an

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