Detroit Lions linebacker DeAndre Levy is asking the NFL why it continues to employ Dr. Elliot Pellman as an adviser to the league on health matters despite his denial of the link between football and chronic traumatic encephalopathy.
Pellman has been involved with discussions of the the league's concussion issues and was the longtime chairman of the league's concussion research committee.
Levy sent a first message to the league through Instagram on Saturday.
"@nfl Why is Dr. Elliot Pellman, the rheumatologist who helped concealed and lied about the link between football and CTE, still employed by you guys," Levy wrote.
Then on Monday night, Levy continued his questioning, asking the NFL, "still no answers? I'll wait. #PraiseNature."
Earlier Monday -- before Levy's second post -- NFL senior vice president for health and safety Jeff Miller said during a congressional roundtable discussion on concussions that there is a link between football and CTE.
"The answer to that question is certainly yes," Miller said.
NFL vice president of communications Brian McCarthy responded to a request for comment from ESPN with the following:
"Dr. Pellman is not a member of any league medical committee and neither sets policy nor provides medical advice on any issue. He performs administrative functions for the committees which are responsible for the implementation of the league's protocols and making improvements as necessary."
Levy isn't the first NFL player to speak up about Pellman. New York Jets offensive lineman D'Brickashaw Ferguson wrote for Sports Illustrated in December that he was "disheartened" that Pellman was part of a group trying to discredit the impact of brain injuries. Pellman had been one of the Jets' team doctors when Ferguson came into the league.
Levy spoke up about the effect of concussions after Chris Borland retired last year, telling MLive in August, "I think you think about it all the time. Any time you have a big collision. Or when you forget something. People forget stuff all the time, but when I forget something, and I know [the reports] that are out there, I wonder, is this football-related or not?"
Levy missed almost all of the 2015 season with a hip injury after signing a contract extension before the season.