Porzingis (heel) is questionable for Thursday's game against the Bulls, Taylor Snow of the Celtics' official site reports.
The questionable tag was expected after Porzingis participated in Wednesday's practice -- the Celtics want to see how his heel injury responds Thursday morning before a decision is made. Porzingis suffered the injury during Sunday's 112-98 win over the Wizards, but it was always believed to be a day-to-day issue.