Zimmermann's (ankle) rehab assignment was transferred to Triple-A Norfolk on Tuesday, Steve Melewski of MASNSports.com reports.

The left-hander began his rehab stint with a start at Double-A Bowie on Saturday. He allowed three runs on five hits across 2.1 innings and will now make his next appearance with Norfolk, presumably later this week. If it ends up being his last outing in the minors, Zimmermann could be activated for the final week of the season, quite possibly to serve as a long reliever.

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