The Orioles optioned Zimmermann to Triple-A Norfolk on Sunday.
After making 13 starts for the Orioles before losing his spot in the rotation and getting optioned to Triple-A on June 16, Zimmermann rejoined the big club Saturday. He worked in a relief role during his one-day stint with Baltimore, covering a scoreless frame out of the bullpen in Saturday's 1-0 win over the Angels en route to claiming a hold. Baltimore will replace him on its pitching staff with Rico Garcia, whose contract was selected from Norfolk ahead of Sunday's series finale.