Pagan was optioned to Triple-A Tacoma on Wednesday.
Pagan was recalled Monday to act as a long reliever for Seattle, but after firing four strong innings in relief Tuesday night, the Mariners will send him back to the minors in exchange for a fresh arm. Pagan's strong performance could warrant another look in the big leagues in the near future, but for the time being, Rob Whalen will take his spot in the majors.