ORCHARD PARK, N.Y. - The Buffalo Bills have hired former Bears offensive co-ordinator Aaron Kromer as an offensive line coach while adding five others to coach Rex Ryan's staff.

Kromer was fired from the Bears in December after a miserable season that also cost coach Marc Trestman and general manager Phil Emery their jobs. Amid Chicago's issues, Kromer admitted he was a source behind an NFL report critical of quarterback Jay Cutler late in the season.

The Bills announced Monday they also hired Michael Hamlin as a special teams quality control coach, Sanjay Lal as wide receivers coach, Anthony Lynn as a running backs coach, D'Anton Lynn as a defensive assistant and Chris Palmer as a senior offensive assistant.

The team is retaining four other coaches: assistant offensive line coach Kurt Anderson, defensive backs coach Donnie Henderson, outside linebackers coach Jason Rebrovich and offensive quality control coach Jason Vrable.