BOSTON (AP) – Boston Celtics guard Tony Allen will miss the rest of the season with two torn ligaments in his left knee.

Coach Doc Rivers said Thursday that Allen will be out at least six months. Allen hurt the knee when he landed awkwardly after an uncontested dunk in the final minutes of a 97-84 loss to Indiana on Wednesday.

Rivers said Allen “was not in good spirits” when he spoke with him earlier Thursday.

“As a coach, you can be emotional, but you still have to function,” Rivers said. “He came to believe he could be a great player in this league and now he has to start over again.” The Celtics have already lost leading scorer Paul Pierce, out since Dec. 20 with a stress fracture in his left foot. Forward Wally Szczerbiak is out at least a week because of ankle injuries.

and guard Delonte West is out with a sore back.

Center Theo Ratliff is out for the season with a back injury.

AP-ES-01-11-07 1705EST