McLouth strained his oblique on Sunday and saw trainers in Atlanta on Monday as the team traveled from Anaheim to Pittsburgh, MLB.com's Mark Bowman writes.
Schafer is expected to get most of the starts in center while McLouth is on the DL. Schafer was hitting .256/.343/.387 at Triple-A Gwinnett with one home run. McLouth was hitting .238/.332/.341 with three homers.
McLouth joins Jason Heyward as outfielders on the disabled list. Heyward (shoulder) went on the DL after Sunday night's game.For more baseball news, rumors and analysis, follow @cbssportsmlb on Twitter or subscribe to the RSS feed.