Calling all Green Bay Packers Fans!! - Don't miss out on this Clay Matthews autographed OC football! Clay Matthews III (born May 14, 1986) is an American football linebacker for the Green Bay Packers of the National Football League (NFL). He played college football for the University of Southern California (USC). He was drafted by the Packers 26th overall in the 2009 NFL Draft. At the end of the 2010 season, ESPN ranked him as one of the best linebackers in the NFL.