Boston Celtics star forward Jaylen Brown is considered day-to-day with a left hamstring injury that he sustained in Wednesday’s preseason finale against the Toronto Raptors.

Brown didn’t participate in live portions of Friday’s practice and coach Joe Mazzulla didn’t answer a question pertaining to whether Brown will play in next Wednesday’s season opener against the Philadelphia 76ers.

“I expect him to be at his best every single day, and then we’ll take it from there,” Mazzulla told reporters. “But just one day at a time.”

Brown grabbed his left hamstring midway through the first quarter of the 110-108 win over the Raptors. He exited the floor and didn’t return to action.

Brown, 28, will be in the lead role this season for Boston with Jayson Tatum (Achilles) slated to miss most of the

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