Brown started the first five games of the regular season in place of Legursky, who injured his knee in the preseason finale. Legursky returned Sunday, started, and played 83 percent of offensive snaps against Cleveland.
"I thought Doug did a nice job in there for just coming back," coach Doug Marrone said Monday. "Colin has struggled before, and we did play Doug much more than we did Colin."
To replace Brown, the Bills promoted offensive lineman Mark Asper from the practice squad. He joins guard Antoine McClain, who was claimed off waivers last week, and tackle Thomas Welch as reserve options along the offensive line.
Here's a recap of the Bills' roster moves over the past two days:
Signed QB Matt Flynn
Placed S Jonathan Meeks on injured reserve/designation to return
Released G Colin Brown
Promoted OL Mark Asper from practice squad
Released OLB Jamie Blatnick from practice squad
Signed OL Bryant Browning to practice squad
Signed LB Jacquies Smith to practice squad