Whalen was recalled from Triple-A Tacoma on Saturday.
As has been the case numerous times this season, Whalen will return to the big leagues to act as a fresh arm in a swingman role. He'll be available for Saturday's game against the Rangers out of the bullpen, so it seems like this trip to the bigs will see him in a long-relief role. To make room for Whalen on the active roster, Zac Curtis was sent down to Double-A Arkansas.