Gallen (forearm) threw 60-plus pitches in a simulated game at Arizona's alternate training site Saturday, Zach Buchanan of The Athletic reports.
Manager Torey Lovullo said the right-hander was throwing at "game-intensity," though it's unclear if he was able to throw any curveballs, which was the pitch on which he was previously experiencing pain in his forearm. The 26-year-old is building up to a starter's workload after suffering a forearm stress fracture during the closing stages of spring training. Gallen will need to work his curveball back into the mix before being cleared for his season debut.