Warren (oblique) will begin a rehab assignment at Triple-A Louisville on Thursday, Bobby Nightengale of The Cincinnati Enquirer reports.

Warren has been on the shelf since July 15 due to a left oblique strain but resumed throwing in early August. He isn't eligible to rejoin the major-league club until mid-September, but he'll work on building up during his rehab assignment and should be a bullpen option for the Reds across the final few weeks of the season.

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