Hayhurst, 28, injured his shoulder this winter while preparing for the upcoming season and will be out for at least four to six months. The operation -- originally described as an exploratory procedure -- was performed by Dr. Schickendantz in Cleveland.
The Jays signed Hayhurst as a Minor League free agent shortly before Spring Training last season, and he spent a majority of the year with Triple-A Las Vegas, posting a 3.75 ERA over 25 games. Over 15 games with the Blue Jays, Hayhurst fashioned a 2.78 ERA with 13 strikeouts and two walks over 22 2/3 innings.
That showing had Hayhurst in a good position to compete for a bullpen job in what is expected to be a wide-open race for a handful of vacancies this spring. The injury is an unfortunate development for Hayhurst, who is the author of the book, "The Bullpen Gospels: Major League Dreams of a Minor League Veteran," which is scheduled to be released on March 30.
Jordan Bastian is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.