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

The Celtics got one starter back for their New Year’s Eve matchup with the Raptors, but their big man in the middle remained sidelined.