Chicago, IL -- (Sports Network) - Chicago Cubs relief pitcher Neal Cotts underwent Tommy John surgery on Thursday and will be sidelined indefinitely.

Cotts was 0-2 this season with a 7.36 earned run average before being demoted to Triple-A Iowa at the end of May. In 12 games in the minors, he was 1-1 with a 2.84 ERA. Dr. Tim Kremchek performed the operation.

In parts of seven seasons -- all in Chicago with the White Sox and Cubs -- the 29-year-old Cotts is 10-12 with a 4.63 ERA in 284 games.