The NFL Players Association has filed a lawsuit to block the suspensions handed to five players.

The players were suspended after testing positive for Bumetanide, a banned diuretic that can mask the presence of other substances, including steroids.

The substance was in a supplement called StarCaps, which did not have Bumetanide listed as an ingredient when the players took the drug.

Attorneys for Pat and Kevin Williams, both Pro Bowl defensive tackles, won a temporary reprieve in Hennepin County District Court on Wednesday, arguing that league officials were aware that StarCaps contained the banned substance but failed to share that information with players.

The Players Association's lawsuit alleges the same argument, claiming that the NFL violated its duty to the players.

The NFL will challenge the ruling of the Vikings' players, said spokesman Greg Aiello, noting that the league policy on steroids and related substances was collectively bargained between the league and the Players Association.

David Cornwell, a Washington-based attorney who represented the Saints players during their appeals, argued that Dr John Lombardo, the administrator of the NFL's policy regarding anabolic steroids and related substances, was aware that StarCaps contained Bumetanide but did not share the information with NFL players.