Pitts, 31, started 114 consecutive games for the Houston Texans from 2002 through 2009, but landed on IR last year with a knee injury. He has experience at left tackle and left guard, though his 6'4", 323-pound frame is much better suited to guard play.
Without considering Kirk Chambers, who is technically a tackle by trade, Buffalo's most experienced interior offensive lineman is Christian Gaddis, who has appeared in just two games in his NFL career. The Bills could really use a player with Pitts' skill set, as many of the team's backup guards - including Jason Watkins, Andre Ramsey and Cordaro Howard - were also tackles in college, and played tackle just a year ago.
Buffalo's roster currently stands at 79 players (including Aaron Schobel), and with two rookies unsigned, it's likely that a player would need to be cut should Pitts be signed.