Zimmermann (ankle) will begin a rehab assignment with Double-A Bowie on Saturday, Roch Kubatko of MASNSports.com reports.

Zimmermann hasn't pitched in a major-league game since mid-June because of biceps tendinitis and a severe ankle sprain. The club said last week that the southpaw still has a chance of returning to log big-league innings this season, and him beginning a rehab assignment over the weekend is a key step toward that becoming a reality. It's unclear how many outings Zimmermann is expected to need in the minors, but he could have a chance to return to the major-league roster by late September assuming he builds up to work as a reliever.

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