Mavs' forward Devean George may require surgery on his right knee after cartilage damage was found, the Dallas Morning News is reporting.

George was injured Wednesday at Portland and the leg stiffened up quickly after he departed the game in the fourth quarter.

"It's tough,'' said Dirk Nowitzki. "It kind of looked like an awkward play. He had a little breakaway and the guy was just trying to foul him and I guess he came down awkward. It's obviously a little frustrating, but injuries are part of the game for every team. You can't complain about it.''