Tampa Bay reassigned Heller to minor-league camp Thursday, Neil Solondz of the Rays Radio Network reports.
Heller has previously made 31 relief appearances in the big leagues, but none have come since 2020 and he's pitched just 8.2 innings in total in affiliated ball over the past two seasons while tending to arm-related injuries. He'll need to stay healthy and pitch effectively at Triple-A Durham for an extended period before getting a look in Tampa Bay's bullpen.