Ron Rivera has only signed one former Carolina Panthers player(LB Jared Norris) since taking over as Washington Redskins head coach last month. But that number will likely be a lot higher by the time free agency starts on March 18th. One high profile former Panther is available to sign right now, but there is competition.
TE Greg Olsen has been with Rivera since their time together on the Chicago Bears. When Rivera got the head coaching job with the Panthers in 2011, he brought Olsen with as a free agent signing.