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Former NFL stars Greg Hardy and Kellen Winslow are among those who registered for The Spring League on Wednesday.
According to TMZ Sports, former NFL cornerback Brandon Browner joined them, and all three players are set to compete when games begin April 15.
Hardy last played in 2015 for the Dallas Cowboys, registering six sacks in 12 games.
The 28-year-old was named to the Pro Bowl in 2013 when he posted 15 sacks for the Carolina Panthers, but he appeared in just one game the following year due to a domestic violence conviction.