The NFL can flag Clay Matthews, but it can't take the danger out of football - The Washington Post
NFL Week 3 in Review: Packers LB Clay Matthews is a marked man
NFL to use Clay Matthews penalty in teaching video
Clay Matthews III heads to Cleveland on special day for his dad - ESPN - NFL Nation- ESPN
Gut Reactions: Packers win Christmas showdown with Browns
Packers: For Clay Matthews, uncertain future is 'not something you dwell on'
Packers release Charles Woodson: Another look at the Green Bay model of roster building, and its influence on John Schneider - Field Gulls
Clay Matthews one of best at converting pressures into sacks
Packers want better line of attack
The NFL can flag Clay Matthews, but it can't take the danger out of football - The Washington Post
Green Bay Packers: What went wrong in 2018 season - Sports Illustrated