San Francisco 49ers co-chairman Dr. John York commented on a recent NFL Players Association survey regarding players’ attitudes toward team doctors, saying the league had yet to see the poll and calling it “non-existent.”

York, who chairs the NFL Owners Health and Safety Advisory Committee, made the comments Tuesday during the league’s annual meeting in Phoenix.

“I don’t know what the questions were,” York said, via The Associated Press. “I have no idea how many players were asked or what the responses were.”

In the poll, which the NFLPA released during Super Bowl week, 78 percent of the players surveyed said they didn’t trust their team doctor at all, while 93 percent had at least some level of mistrust. The NFLPA didn’t reveal how many players were polled and in what manner.

The NFLPA responded in a statement obtained by NFL Network’s Albert Breer, saying, in part, “The day the NFL commits itself to taking care of players who have been injured at work is the day we begin to take these types of comments seriously.”

The NFLPA added Tuesday that Dennis Curran, NFL general counsel and senior vice president of labor litigation and policy, sent the union a letter Monday asking to see the study. The NFLPA said it will respond “in short order.”

According to The AP, York was confused that the NFLPA did its own survey despite a collective bargaining agreement clause that requires both sides to do one jointly. The NFL and NFLPA must agree on who handles the testing, how questions are asked and who analyzes the answers.

“When you go and report that there is a survey by only one of the entities and that it is negative,” York said, via The AP, “I believe you have muddied the waters so much that you can’t turn around in five minutes to do another one. So there needs to be some passage of time before we can do an honest and accurate survey.”

– Marcas Grant, contributing editor; The Associated Press contributed to this report.