A blueshirt is a player who arrived on campus as a "preferred" or "recruited" walk-on and goes on to earn a football scholarship. The NCAA doesn't allow for schools to produce written promises of scholarships to walk-ons, but that doesn't stop a school from telling a prospect who walks on that an offer is coming after a certain point.
"There are a couple of different ways you can award a blueshirt scholarship," one Big 12 coach said. "We'll have some cases of a player arriving for the start of fall practices, and we'll then immediately put them on scholarship after the end of fall camp, then count the scholarship forward - against the 2015 class, for example - and announce them on the following signing day.
"The other way is if there's a player, and we know we'll have a scholarship coming open at a certain position. We tell them if you come as a freshman, pay your own way, a scholarship will come open at this point in time, and it's yours."