Celtics remain short-handed ... and coachless

WALTHAM, Mass. -- Paul Pierce, Rajon Rondo and Kevin Garnett all remained out of practice Monday, while coach Doc Rivers also missed the session to attend to a personal matter, as the Celtics got back to work at the Sports Authority Training Center at HealthPoint.

Rivers is expected to rejoin the team for Tuesday's practice session. The Celtics begin a three-game road trip by visiting the Heat on Wednesday.

While Rondo (sore left hamstring) did not take part in drills, he was on the court, lifting a few shots at times alone at one end of the floor, while also shouting instructions to teammates as they closed out the session with 5-on-5 work.

"I didn't talk to [trainer] Eddie [Lacerte] today, but [Rondo] came out," said associate head coach Tom Thibodeau, who led the team through practice and handled the media chores. "He was coaching and involved -- champing at the bit. I'm assuming he's feeling better, but I'm not sure if he's ready yet."

After meeting with the media Saturday, Pierce (right knee infection) expressed hope that he might be able to practice Monday, but the knee still has him limited after two procedures to drain it last month. Pierce worked out lightly and received treatment, and is expected to travel with the team. He will address the media following Tuesday's session to update his status.

"Paul was moving around, he did some shooting, things like that," said Thibodeau. "He's feeling pretty good and improving day by day."

Garnett (hyperextended right knee) attended the session and it's believed he worked out in the weight room. Rivers indicated Saturday that Garnett likely will be out for the next 10 days as he recovers after being kicked in that surgically repaired knee twice last week.

Being short-handed -- only 11 players participated -- meant extra work for everyone, but Thibodeau generally liked what he saw out of the session.

"Practice was good and bad," said Thibodeau. "Normally after a day off, it's a little sloppy, but the intensity I thought was very good, and intentions were very good."

Tony Allen, who hyperextended his left arm in Saturday's win over the Raptors, participated fully and showed no lingering effects from the injury.