Former San Francisco 49ers safety Eric Reid has filed a collusion grievance against the NFL, reports ESPN.com's Dan Graziano.
Reid will be represented by Mark Geragos, who is also the attorney for Reid's former teammate Colin Kaepernick.
Reid has previously said he believes he could be looking for a job because of his protests.
The 26-year-old Reid had 67 tackles and two interceptions for the 49ers last season and has been only one free agent visit this offseason - with the Cincinnati Bengals.
"The notion that I can be a great signing for your team for cheap, not because of my skill set but because I’ve protested systemic oppression, is ludicrous.