The Giants optioned Hjelle to Triple-A Sacramento on Thursday.
With Anthony DeSclafani finishing spring training healthy after initially being eased while he worked back from last July's ankle surgery, he appears set to serve as the Giants' long-relief option and preferred spot starter. The presence of DeSclafani and another multi-inning relief option in Jakob Junis leaves no room for Hjelle, who sputtered to a 5.76 ERA and 1.64 WHIP over 25 innings in the big leagues a season ago.