Carolina Panthers defensive end
Hardy's agent Drew Rosenhaus said, "We are working very closely with the NFLPA on this process," adding that he hopes his client will be reinstated soon.
Like Peterson, Hardy spent the majority of last season on the commissioner's exempt list, which prevented him from playing.
Hardy was convicted last summer on two counts of domestic violence. He appealed and had both charges dismissed Feb. 9 when his accuser couldn't be located to testify.
The NFL says it is reviewing Hardy's case.
NFL spokesman Brian McCarthy said the ruling on Peterson is "irrelevant" to Hardy's case. Hardy will become an unrestricted free agent March 10.