BOSTON -- Celtics coach Doc Rivers said that forward Kevin Garnett could be sidelined for an additional 10 days or more with a hyperextended right knee.

Discussing injuries to his three starters -- Garnett, Paul Pierce (right knee infection) and Rajon Rondo (sore left hamstring) -- Rivers said Pierce and Rondo were the closest to returning, with Garnett potentially looking at a three-week recovery window after being kicked in his surgically repaired knee twice during a three-game western trip this past week.

"KG's still 10 days, maybe, I don't know," said Rivers. "I have no idea, I honestly don't. There is some history with hyperextended knees that we kind of know that it takes at least two weeks, sometimes three. We know it won't be longer than that, but we don't know how quickly. There's a history there -- not with [Garnett] -- but with league history."

As for Rondo and Pierce, Rivers was more optimistic they would return during the upcoming three-game road trip.

"Rondo and Paul would be first in line," said Rivers. "I think Rondo will play in the Miami game. I think Paul is 50/50, he'll try to practice on Monday and we'll see how it feels. With infections, we don't know how to treat that, nobody [here] has ever had that. We'll find that out. We don't know what will happen once he practices. It could swell, it could feel great. We just have to wait and see."