For the first time this season, the Nets could have to play without Jason Kidd.

"It's been hurting him the last couple of games," Lawrence Frank said after practice. "Then it was really hurting him against Orlando (Saturday night)."

Kidd, who had a minor back problem earlier this season, made no mention of the injury Saturday night after the Nets' third straight victory. That was the second game of a back-to-back set, with travel.

Although he is listed as "questionable," the injury appears significant because Kidd had to have treatment for several hours Sunday, followed up by yesterday's session. Frank said the team has not run any other tests and chose not to specify the nature of the injury.

"We'll wait and see how he feels" regarding tonight's game, Frank said.