Guard John Miller will visit with the Bengals on Thursday, according to NFL.com’s Ian Rapoport (on Twitter). To date, Miller has spent all four years of his pro career with the Bills. 
Miller, a third-round pick in 2015, has started 47 games over the last four years with Buffalo, including all 15 of his games last year. The Bengals could stand to upgrade their O-line even after re-signing right tackle Bobby Hart, so Miller could help them solidify the unit.
Miller has only played at right guard in his professional career, a position that Alex Redmond held down in 2018 for Cincinnati. Redmond, a former UDFA, performed decently, but he was hardly a world-beater, and the same can be said for left guard Clint Boling. At the very least, Miller would provide young, experienced depth.
For what it’s worth, Pro Football Focus’ advanced metrics preferred Miller to Redmond last year. Miller was demoted in favor of Vlad Ducasse during the 2017 season, but he regained his starting job in 2018, and he may have done enough to land a modest multi-year pact.
One year ago, the Bills traded left tackle Cordy Glenn to the Bengals, and Miller could soon reunite with his former line mate in Cincinnati.