Former Packers, Rams OLB Clay Matthews announces 'playing days are over'
Clay Matthews on latest roughing-the-passer call: NFL is 'getting soft' - The Boston Globe
Clay Matthews taken to ER after freak softball injury (Video)
Clay Matthews 'rejuvenated' back on the outside
Official attempts to explain game-changing penalty on Clay Matthews
Out with the old and in with the new, Waukesha County Sports
Former Packers LB Clay Matthews reacts to Rashan Gary wearing No. 52
Big D leads Green Bay Packers to Big D - The San Diego Union-Tribune
NFL: Packers' linebacker Matthews says he will roll with inside role - Duluth News Tribune