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Kieboom has been diagnosed with a sprained UCL in his elbow in addition to a flexor mass strain in his forearm, Chelsea Janes of The Washington Post reports.

The additional issue helps explain why the Nationals placed him on the 60-day IL. Kieboom will be shut down and rested for at least six weeks before being allowed to resume baseball activities, so his absence could extend well past 60 days, but the club is hoping he will be able to avoid Tommy John surgery -- which would be the likely next step if the ligament strain becomes a full tear. Non-roster invitee Maikel Franco is the current favorite to see most of the playing time at third base while Kieboom is out of action.

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