The Raiders released the former Pittsburgh Steelers standout receiver on September 7, and he signed with New England.
According to ESPN's Chris Mortensen, as part of discovery, the Raiders turned text messages over indicating that Brown asked owner Mark Davis for his release multiple times.
Brown filed a separate grievance against the New England Patriots, asking for $10 million in guarantees he didn't receive.
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Antonio Brown's chances of repaying $ 29 million in contract guarantees from the Raiders via complaint were not helped by a report Sunday on texts he sent to owner Mark Davis before Oakland released him almost two months ago. It will be interesting to see what happens with these grievances and whether or not Brown will get the money he believes he's owed. He has kept a lower profile in recent weeks, however, and there are a handful of contending teams fairly desperate and motivated to upgrade at the receiver spot, and Brown's name has come up in internal discussions in several personnel meetings, sources said. If he were to return, there is a possibility that the league would place him on the commissioner's exempt list.
Antonio Brown has had a turbulent last few months and much of it has to do with his tenure with the Oakland Raiders.
While it's likely the Patriots will end up having to pay Brown the $9 million signing bonus, the reported text messages to Davis make the Raiders' case in that grievance even stronger.