Pitcher Hyun-Jin Ryu has been placed on the 10-day injured list by the Los Angeles Dodgers due to neck soreness.
Friday's move was made retroactive to Thursday. The left-hander leads the majors with a 1.53 earned run average and has 11 wins. Ryu threw six scoreless innings at Colorado Wednesday while yielding three hits with a strikeout.
He left the game after throwing only 80 pitches. Dustin May, who will make his Major League debut Friday against San Diego, was recalled from Triple-A Oklahoma City.
Los Angeles also recalled pitcher Tony Gonsolin and optioned Dylan Floro. To make room for May on the 40-man roster, Scott Alexander was moved to the 60-day injured list.