Padres right-hander Josh Johnson will undergo Tommy John surgery tomorrow and miss the entire 2014 season, tweets MLB.com’s Corey Brock.

It’s a blow to a Padres pitching staff that was hoping for big things in a rebound campaign for Johnson, though the injury does trigger a $4MM club option that the Padres will now be able to exercise. Due to his extensive injury history, Johnson’s contract — a one-year, $8MM pact — contained language that gave the Padres a $4MM club option were he to make fewer than seven starts in 2014.

Johnson didn’t take the mound for the Padres after signing the deal, as he opened the year on the disabled list with a strained flexor muscle in his right arm, which, upon further examination by Dr. James Andrews, led to the recommendation to undergo the Tommy John operation. Johnson becomes the latest in a long line of injured hurlers to undergo the procedure this year, as he is now incredibly the 16th Major League starter to need the operation in 2014 alone.

Despite the loss of Johnson (and fellow Tommy John victim Cory Luebke), San Diego’s rotation has been excellent this season. The quintet of Andrew Cashner, Tyson Ross, Ian Kennedy, Eric Stults and Robbie Erlin have combined for a 3.12 ERA (ninth in the Majors) and a 3.26 FIP (fifth in the Majors).