Clarke (back) is scheduled to make a rehab start start for High-A Visalia on Saturday, Nick Piecoro of the Arizona Republic reports.

The Diamondbacks are hoping the right-handed Clarke can get up to six innings or 75 pitches. If he can hit those benchmarks, Clarke would be a possibility to make a start for Arizona next Friday, the first time the team will need a fifth starter in the second half.

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