After one preseason game, an essentially red-shirted regular season and about two months worth of off-season workouts, the Buffalo Bills have seen all they needed to see with Tarvaris Jackson. The team announced Monday night that they have released the veteran quarterback, the night before the start of the team's mandatory mini-camp.

Jackson's removal from the roster means that first-round pick EJ Manuel and free agent signing Kevin Kolb will be the only competitors for the starting job in 2013. Throughout Organized Team Activities, Jackson and Kolb split the majority of team repetitions, while the Bills focused on bringing Manuel along slowly.

With Jackson out of the way, it opens room for the young quarterback to not only get more reps throughout practice in helping the Bills get Manuel more prepared for the season, but to also help the team see just how quickly Manuel can get on to the field in a full-time capacity.

The Bills traded for Jackson during the preseason in 2012, sending a seventh-round pick to Seattle for the quarterback's services. Jackson was acquired shortly after releasing Vince Young. The only time he appeared in a game with the Bills was in the team's preseason finale in Detroit against the Lions, where he was worked in during the second half.

Jackson's release leaves Manuel, Kolb and rookie Jeff Tuel on the roster as the team's remaining quarterbacks. He was re-signed this off-season to a one-year deal.