WALTHAM, Mass. — Boston Celtics coach Doc Rivers says there is a strong possibility that Kevin Garnett will miss the whole postseason.

The All-Star forward has missed most of the last two months with a strained right knee. He had been recovering with an eye towards the playoffs, but Rivers said he had to shut Garnett down at practice Thursday morning and "there's no way" he could play right now.

Rivers said on a radio show that Garnett was frustrated but understood that it was the right thing to do.

The defending NBA champions begin the best-of-seven first round series against the Chicago Bulls on Saturday.