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Penrod was placed on the 7-day injured list at Triple-A Worcester due to left shin inflammation Sunday, Christopher Smith of MassLive.com reports.
Penrod will be forced to miss a week of action with what the Red Sox are hopeful will be a "short-term" shin issue. The left-hander has made two starts with Worcester after being promoted in late May, producing a 3.38 ERA with eight strikeouts over eight innings.
