Castro, who will be a free agent after this season, will split the catching duties in 2016 with Max Stassi, who appears set to take over the backup job following last year's trade of Hank Conger to the Rays. The Astros could still make a move to bring in a veteran catcher to compete with Stassi, but it appears he's got a strong shot to make the club.
"I would consider Castro and Stassi as the guys that are penciled in," general manager Jeff Luhnow said. "We do have some other guys at the Minor League level that are going to be in big league camp that we like and we think could contribute up here.