Pirates director of sports medicine Todd Tomczyk said Wednesday that De Jong (knee) underwent an MRI after being placed on the 10-day injured list Tuesday, Kevin Gorman of TribLive.com reports.

Tomczyk didn't reveal the results of the MRI, but the fact that De Jong was sent in for further examinations implies that the Pirates had some level of concern he was dealing with something more significant than left knee inflammation. De Jong will be eligible to return from the IL before the end of the month, but the Pirates likely won't have a clear idea of when he might be ready for activation until he starts throwing again.

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