(SportsNetwork.com) - Former NFL players Christian Ballard and Gregory Westbrooks are suing the players union over head injuries.
The lawsuit was filed Thursday in the U.S. District Court for the Eastern District of Missouri. Former union presidents Trace Armstrong, Troy Vincent and Kevin Mawae were named in the suit.
The NFLPA responded with the following statement Friday:
"It erroneously alleges that the NFLPA knowingly and fraudulently concealed from players the risks of head injuries players faced by playing in NFL games and practices over the last several decades. This lawsuit has no merit and we will defend our union and our past Presidents.
"The NFLPA has made the health and safety of its members a priority and the advancements in professional football on concussion education, prevention and treatment are a result of our efforts."
Ballard was a defensive end for the Vikings in 2011 and 2012
The 61-year-old Westbrooks played from 1975-81 as a linebacker and special teamer with the Saints, Raiders, St. Louis Cardinals and Los Angeles Rams.
Earlier this month, a federal judge granted preliminary approval of a revised settlement agreement between the NFL and former players who sued the league over concussions.