The Boston Celtics will be without several key contributors on Monday when they take on the New Orleans Pelicans.

Kyrie Irving, who has been nursing a sore shoulder since Thursday's win over the New York Knicks, was officially ruled out early Monday afternoon by the Celtics, along with Aron Baynes, who has been dealing with a sprained left ankle. Guerschon Yabusele is out too -- after Yabusele suffered a bad sprained ankle against the Chicago Bulls, Brad Stevens said he might miss extended time.

Al Horford and Gordon Hayward, meanwhile, are both doubtful -- the former with continued knee soreness and the latter with an illness. Horford's knee soreness has been an issue for much of the season, although the Celtics have done their best to manage it with rest.

Robert Williams is expected to be with the Celtics tonight, after being excused for a personal absence. Assuming Horford is out, along with Baynes and Yabusele, Williams might get more extended run.

The Celtics called up P.J. Dozier as well -- the two-way wing who got surprise minutes against the Cleveland Cavaliers a little over a week ago.

Stevens said he didn't expect Dozier to play against the Cavaliers.

"You're hoping to say hello, and maybe eat a meal together, and enjoy warm-ups and those type of things," Stevens told reporters in Minnesota.

The odds of Dozier getting minutes, it would seem, are a lot better on Monday.