White Sox's Brad Keller: Had thoracic outlet surgery

Keller underwent thoracic outlet syndrome surgery over the offseason, Daryl Van Schouwen of the Chicago Sun-Times reports.

Keller dealt with thoracic outlet syndrome symptoms on a couple occasions last season while with the Royals and evidently at some point opted for surgery. He inked a minor-league deal with the White Sox last week and "threw the ball really well" during a recent live batting practice session, per manager Pedro Grifol. Keller is expected to begin the season at Triple-A Charlotte but could become an option for Chicago's rotation before long.