The Dallas Cowboys have wrapped up a key defensive player for the long haul after agreeing to a massive contract extension with Quinnen Williams — and we now have an idea of how that new contract could impact Dallas' cap space situation. How Williams' extension impacts Cowboys salary capDallas Cowboys owner Jerry Jones. According to Over The Cap, the Cowboys are sitting with about $5.4 million in cap space currently, so they could have nearly $20 million to work with after Williams' extension. | IMAGN IMAGES via Reuters ConnectWith that anticipated injection of cap space, the Cowboys are well-positioned to make at least another significant move. — Sign up for the Cowboys Daily Digest newsletter for more free coverage from Dallas Cowboys on SI —