Giovanny Gallegos, Chasen Shreve, and Adam Warren all started the season with the Yankees, but ended up on different teams. They all fell behind on the depth chart in the bullpen, and none pitched exceptionally well, so they were all expendable in their own right. That doesn’t mean they didn’t provide any value though.
Extremely unintentionally, parting with Gallegos and Shreve might have been the most important move the Yankees made this past season. They were shipped to the Cardinals in exchange for Luke Voit.