Warriors guard Jason Richardson is listed as questionable for tonight's game against the Los Angeles Lakers at the Staples Center because of a back injury.

After Thursday's practice, in which he did not participate, he said his back was sore. Richardson said he felt a pop after he got up off the court following a drive to the basket in the fourth quarter of Wednesday night's game against Dallas. He said the pain -- in the lower-right part of his back -- was tolerable until he took his free throws.

He missed the second attempt, and guard Derek Fisher had to commit a foul to get Richardson out of the game. Richardson wasn't available for postgame interviews Wednesday, receiving treatment instead.

An MRI on Thursday didn't reveal any tears. He underwent further tests, including an X-ray, after practice. Warriors coach Mike Montgomery said that as long as there is no chance for further injury, whether Richardson plays will be up to Richardson.

"If I'm 50 percent, I'm playing," said Richardson, who may have initially hurt his back Monday against the Los Angeles Clippers in a collision with Clippers forward Elton Brand. "I don't sit out games unless I can't move."