Stewart, who batted .289/.320/.340 in 172 plate appearances in 2015, will again serve as Francisco Cervelli's backup behind the plate, the Pittsburgh Tribune-Review reports.
Fresh off signing a two-year contract, Stewart has hit for a decent average but offers little in the way of power or speed. His biggest contribution may actually come as starter Gerrit Cole's catcher. Cole went 12-4 with a 2.24 ERA when Stewart caught and 7-5 with a 3.59 under Cervelli's guidance.