A fifth-round pick (139th overall) out of Missouri by the Kansas City Chiefs in 2009, Brown (6-7, 335) has yet to appear in an NFL game. Brown played for the Hartford Colonials of the United Football League this season before joining the Ravens' practice squad on November 23.
Buffalo will need to make a corresponding roster move to add Brown, who is guaranteed three game-checks from the Bills. Wide receiver Lee Evans, who injured his ankle on Sunday, may be placed on injured reserve.
"I firmly believe that any man’s finest hour, the greatest fulfillment of all that he holds dear, is that moment when he has worked his heart out in a good cause and lies exhausted on the field of battle – victorious."