Muller could follow starter Mitch Spence as a long reliever during Friday's game against the Royals, Martin Gallegos of MLB.com reports.
Advice: With the A's rotation plagued by injuries, Muller was initially an option to start Friday's series opener. However, Oakland will hand the ball to Mitch Spence -- who's gone three or more innings six times this season -- to start the contest. Still, Muller could follow Spence and see multiple innings of work if needed.
Rotowire.com
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