Gsellman will look into having surgery this offseason on the partially torn labrum in his non-pitching shoulder, ESPN's Adam Rubin reports.
He was unable to swing a bat while at the big league level and for part of his time with Triple-A Las Vegas, so it's an issue he will be addressing this offseason. However, this shouldn't affect his status for spring training. Gsellman's excellent performance with the big league club this year would seem to have earned him a spot in the 2017 rotation, and while he should regress at least slightly, the Mets may have yet another excellent young starting pitcher in tow.