The 23-year-old has led the Jags to just five wins during his two seasons with the side.
The quarterback told the Florida Times-Union: "The best guy is going to win. That's why this sport is so intriguing to people and so fun to be a part of. The competition is daily. Every practice will be a mini-game.
"You need to put your best foot forward regardless of the situation. That uncomfortable feeling is a good feeling and that's why good teams are successful, because they have that competition. It's going to be a blast."
Gabbert missed the final six games of the 2012 season with arm and shoulder injuries.