Gradkowski left Friday's preseason game against the Lions with a left hamstring injury, Ed Bouchette of the Pittsburgh Post-Gazette reports.
Gradkowski suffered the injury on a scramble, but the severity of the injury is not yet known. This could mean even more injury trouble for the quarterback who missed all of last season after having surgery on his finger. He was re-signed this offseason to compete with Landry Jones for the backup quarterback spot behind Ben Roethlisberger.