Originally written on Fox Sports Wisconsin  |  Last updated 11/20/14

GREEN BAY, WI - DECEMBER 7: Clay Matthews #52 of the Green Bay Packers celebrates after he sacked Joe Flaco #5 of the Baltimore Ravens in the first half at Lambeau Field on December 7, 2009 in Green Bay, Wisconsin. (Photo by Jonathan Daniel/Getty Images)
Former USC linebackers Clay Matthews and Brian Cushing were supposed to be leading their respective NFL defenses against each other when the Green Bay Packers visit the Houston Texans on Sunday night, and Matthews is upset that likely won't happen due to what he views as a hole in the NFL rulebook.Cushing left the Texans' Monday night win against the New York Jets in the second quarter with what is feared to be a serious knee injury suffered on a block from behind, and Matthews immediately took to Twitter to voice his displeasure with the NFL's lack of protection of defensive players."Where is the NFL's protection on blocks below the waist like that on Cushing. Double standard," Matthews tweeted, then adding, "If the NFL really wants to increase player safety, start protecting players on BOTH sides of the ball."Matthews, who has nearly 470,000 Twitter followers but rarely uses the social media tool, was commenting on a play in which Jets guard Matt Slauson appeared to roll up on Cus...
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