Young has been bothered by inflammation in his pitching shoulder for his last four starts. He'll go on the DL on Friday. He had a second cortisone shot on Wednesday night.
Ace Jake Peavy was placed on the DL on Saturday, a day after learning he would be sidelined at least a month because of a strained tendon behind his right ankle.
The Padres have lost five straight and 13 of 17, as well as a major league-record 13 straight interleague games.