Festus Ezeli is seeking a second opinion on his ailing left knee.
Ezeli is not traveling with the Portland Trail Blazers on their five-game East Coast trip.
Ezeli has yet to appear in a game following a procedure he underwent on his knee in August.
Ezeli appeared to be making progress toward a return last month, when he went through portions of a practice on Oct. 18 and announced afterward that "The Sheriff (was) back in town."
Ezeli subsequently endured swelling and pain with concerns emerging about the long-term health of his knee.