Boston's center, who has been slowed by injuries this year, struggled with his fellow starters Sunday in a loss at Oklahoma City.

Will one-time Boston Celtics All-Star center Kristpas Porzingis suit up for the first time since Christmas on Friday night against the Atlanta Hawks? Porzingis

Another Celtics star remained sidelined, however. Jaylen Brown missed his second straight game with a right shoulder sprain. Al Horford also sat out for rest purposes on the second night of a back-to-back.