CLEVELAND -- The Guardians optioned lefty Joey Cantillo to Triple-A Columbus on Sunday, creating a sudden opening in their starting rotation as the season enters the stretch run.

Cantillo was slated to start for the Guardians on Wednesday against the D-backs. Cleveland assistant general manager Matt Forman said Sunday that the team is “actively discussing” how they will handle the open rotation spot.

For what it’s worth, the Guardians have an opening on their 40-man roster, and lefty Parker Messick (their No. 12 prospect) has put himself on the map for a potential callup with his strong season in Columbus.

Cantillo, 25, opened the season in Cleveland’s bullpen before the Guardians optioned him to Columbus to stretch out on May 27. They summoned him back to the big leagues on July 3

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