The Jaguars' official Twitter account reported that Gabbert left the game with a sprain of his throwing hand:
Blaine Gabbert has a sprained right thumb. Was coming out of the game anyway. More information following the game. #JACvsNYJ— Jacksonville Jaguars (@jaguars) August 18, 2013
Still, Gabbert will start for the Jaguars in Week 1 against the Chiefs.