The Celtics will be without center Jermaine O'Neal for at least another week, according to coach Doc Rivers.

O'Neal is dealing with a left knee injury and Rivers said prior to Wednesday night's game against Portland that trainer Ed Lacerte hasn't yet updated him on the veteran's status.

Rivers said he spoke to O'Neal on the phone Wednesday and the lack of an update from Lacerte means the center is more than a week from returning to the lineup.

O'Neal hasn't played since Nov. 8 against Dallas.