The Mariners also announced Thursday that they are optioning Nick Franklin back to Tacoma and optioning right-handed starter Erasmo Ramirez to Single-A High Desert so he can stay on normal rest with off days coming up in Seattle's schedule.
Seattle intends to make another roster move before Friday's game to fill out the 25-man roster.
Gillespie hit .362 with five doubles, five home runs and 14 RBIs in 16 games at Tacoma. Gillespie has appeared in 78 major league games with Arizona, San Francisco and the Chicago Cubs.
Franklin appeared in seven games after being recalled from Tacoma on April 16.
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