Buchanon signed with the Bills on Tuesday, BuffaloBills.com reports. Buchanon was a seventh-round pick of the Patriots in 2013, and with the Bills having one of the league's best defensive line units - if not the best - he'll serve as a depth piece.

Patriots signed No. 226 overall pick DE Michael Buchanan to a four-year contract. The 6-foot-5, 255 pound end is expected to compete for a special teams role as a rookie. His signing leaves WR Aaron Dobson as the Patriots' lone unsigned rookie.