https://twitter.com/ChrisForsberg_/status/1395474749229342721
Williams is currently dealing with turf toe, which caused him to miss the final four games of the regular season. He returned to the lineup Tuesday for the Celtics’ play-in game vs. the Wizards, but he re-aggravated the injury during the first half. He briefly returned to the game to start the second half but was ultimately unable to finish. Williams also missed Thursday’s practice due to the injury, and head coach Brad Stevens said he doesn’t expect Williams to practice on Friday, either.
Turf toe is not an injury that you typically associate with basketball, but it is more of a pain-tolerance issue than anything else.