He played for the Spokane Shock, San Antonio Talons and Pittsburgh Power of the Arena Football League (AFL).

He played collegiately for the Texas Tech Red Raiders for four seasons, throwing for a total of 1,578 yards, 17 touchdowns, and 5 interceptions.

Sheffield became the backup, and saw action in the second game against Rice University, when he threw a 26-yard touchdown to Tramain Swindall for his first career TD.

After two effective games against ranked teams Texas and Houston, Potts was knocked out with a concussion late in the first half with the score tied at 7 with the New Mexico Lobos.

Sheffield entered the game with just over one minute left and led a 4-play drive that was capped with a last second TD pass to flanker Alexander Torres, giving the Raiders a 14-7 halftime lead.

Potts started and was named MVP of the game, although Sheffield did lead the Red Raiders on two touchdown drives to secure the win.

Sheffield would play at quarterback for the final time against the Weber State Wildcats on Senior Day, and left the game to a standing ovation.

Source:[4] After college, Sheffield was invited to the Competitive Edge Sports NFL Preparation Camp in Atlanta, Georgia where he spent three months and performed well.

[citation needed] At the end of 2012, Sheffield announced via Twitter and Facebook he was returning to Lubbock to attend Texas Tech to "focus on my education and future and put my football career on hold, for now."