Henriquez was held back in extended spring training, Jonathan Mayo of MLB.com reports.
Henriquez, who was acquired from Texas in the Mitch Garver trade, logged 93.2 innings across High-A and Double-A last year, so there wouldn't be a workload reason to hold him back. With this in mind, he is likely either injured or working on his mechanics. He should eventually be assigned to Double-A Wichita.