"I think he's a good football player; there's no doubt," Ryan said at Bills running back LeSean McCoy's charity softball game Saturday evening. "We'll do our due diligence, so to speak, but I'm pretty happy with our guards."
The Bills are optimistic that they have improved at guard this season after signing veteran Richie Incognito and drafting John Miller in the third round. Their guard play last season -- which included starts from Erik Pears, Kraig Urbik, Chris Williams and Cyril Richardson -- was rated among the worst in the NFL by Pro Football Focus.
Mathis was PFF's top-rated guard from 2011 through 2013 and their second-ranked guard last season.
Cap space could be the Bills' biggest impediment to making at run at Mathis. NFLPA records list the Bills with $6.1 million in 2015 cap space, but a chunk of that amount must be devoted to practice-squad signings and in-season injury replacements. The Bills have approximately $3 million in 2016 cap space, according to ESPN Stats & Information, which further hampers their financial situation.