Ryu, who made his big league debut in 2013, has appeared in just one game over the past two seasons due to injuries. He missed the entire 2015 season after a shoulder surgery in May that year. He returned to action on July 7 last year against the San Diego Padres, but was touched for six earned runs on eight hits in 4 2/3 innings. That would be the only start he'd make in 2016, as lingering pain sidelined him again.