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Casas (ribs) is expected to begin a rehab assignment Tuesday with Triple-A Worcester, Alex Speier of The Boston Globe reports.

The first baseman has been on the shelf over three months due to a strain and torn cartilage in his left rib cage, but he's now been cleared for game action. It's unclear how many rehab games Casas will require before rejoining the Red Sox, but he should have a chance to be activated during the first half of August.

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