Graveman spent two weeks quarantined in San Diego. Before he was sidelined, he had been one of the league's top relievers. He recorded five saves and did not allow a run in 16 2/3 innings over 14 appearances.
Manager Scott Servais said he'll likely ease Graveman back into his usual role. He hasn't pitched in a major league game since May 16 — against Cleveland — and made just one rehab appearance for Triple-A Tacoma on June 8.
The Mariners also activated right-hander Justin Dunn (shoulder) to start the series opener.