Brad Keller #40 of the Chicago Cubs celebrates after the final out in game three of the National League Division Series against the Milwaukee Brewers. Getty Images

The Yankees have expressed interest in free agent Brad Keller, The Post has learned.

Keller is coming off a breakout season as a Cubs reliever and is a popular player in free agency with teams looking at the righty as a starter and out of the pen.

The Yankees seemingly are most interested in Keller as a reliever. However, the Yankees need rotation cover early next season as Gerrit Cole and Carlos Rodon recover from elbow surgery. They already signed Ryan Yarbrough with the idea that the lefty would start early in the season and – when/if Cole/Rodon return – he could be folded into the pen with experience having done both.

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