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

One player whose injury history is always talked about is center Kristaps Porzingis. Porzingis made his return to the Celtics lineup a few weeks ago but his presence on the court

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.