De Leon was diagnosed with a torn UCL on Wednesday and will require Tommy John surgery, Marc Topkin of the Tampa Bay Times reports.

Once highly touted as a pitching prospect, De Leon missed significant time last season due to a lat strain, forearm tightness and ultimately elbow tendinitis. He'll head to see Dr. James Andrews for a second opinion according to Topkin, but the worst-case scenario is still expected. De Leon will now miss the entirety of the 2018 season while rehabbing from the major procedure with the hopes of returning during the early portion of 2019.

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