Incognito, who played three games with the Bills in 2009, is expected to take a physical and see if he's a possible fit to play under new Buffalo coach Rex Ryan.
The Bills are in desperate need of quality guards. They are expected to run the ball a lot next season under Ryan and new offensive coordinator Greg Roman.
Incognito, 31, last played with the Miami Dolphins in 2013. He also made the Pro Bowl following the 2012 season. However, he is most infamous for the high-profile bullying scandal involving former Dolphins teammate Jonathan Martin. An NFL investigation revealed Incognito and two other offensive linemen -- John Jerry and Mike Pouncey -- harassed Martin, who was later traded to the San Francisco 49ers. Incognito was suspended for his final eight games with the Dolphins.
The NFL cleared Incognito last summer to resume all football-related activities. He had visits with the Tampa Bay Buccaneers in August and Denver Broncos in November but remained out of football for the 2014 season.
The Bills are the first team to host Incognito this offseason.