Smith: NFLPA still concerned about Chargers doctor

"The fact is that despite having previous malpractice liability judgments against him, neither the Chargers nor the NFL initiated an inquiry or provided any oversight of the doctor the team selected to provide care for our players," Smith said in a statement released to The Associated Press. "This Article 50 and any subsequent investigations will be initiated when there is credible evidence that calls into question the treatment given to a player and the overall medical care being provided by team selected doctors."

At a pre-Super Bowl news conference, Smith called for Chao to be replaced as team doctor, and the NFLPA filed a complaint.

Quoting a club source it did not identify, the U-T San Diego reported Sunday that three independent doctors "totally exonerated" Chao.

The NFL and the Chargers refused to confirm the report, citing confidentiality.

Chao hasn't returned calls and texts seeking comment.

According to online records, the Medical Board of California is seeking to revoke Chao's license and has referred the case to the state attorney general for possible charges. A complaint alleges gross negligence, repeated negligent acts and failure to maintain adequate and accurate medical records.