Zimmermann (ankle) is expected to start Tuesday's game against the Red Sox, Nathan Ruiz of The Baltimore Sun reports.

He gave up five earned runs while striking out nine in 6.1 innings through two rehab starts. Zimmermann will take the rotation spot of Keegan Akin, who is done for the year with a left adductor strain. Zimmermann could make two starts next week if the Orioles stick with a five-man rotation.

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