McLouth strained his oblique while leading off Sunday afternoon's series finale against the Angels in Anaheim. The veteran center fielder felt a sharp pain while holding back on a curveball in the dirt.
When the Braves' trainers checked on McLouth again Monday, he informed them he was still feeling pain in his left side.
Schafer will likely serve as Atlanta's center fielder over the next two weeks. This was the role he possessed when he made his Major League debut and then spent the first two months of the 2009 season with the Braves.
Over the past two years, Schafer has struggled with a left wrist injury he suffered during his first week as a Major Leaguer. But while hitting .256 with a homer and eight doubles in 42 games with Gwinnett this year, the 24-year-old outfielder has started to once again show promise.
Schafer's struggles have been well-documented. After being named the organization's top prospect, he missed most of the early portion of the 2008 season serving a 50-game suspension because of a link to HGH. The young outfielder made a great impression during Spring Training the following year and homered twice during his first three games in the Majors.
But Schafer injured his left wrist during the fourth game of the 2009 season and immediately began a downward spiral that would carry him through the end of the '10 season.
Schafer hit .204 during his two-month stint in Atlanta and then played just nine more games for Gwinnett during the 2009 season. He underwent surgery in September and then struggled to regain all of his strength in 2010. He hit .201 in 52 games with Gwinnett last year and then played just 18 more games after being optioned to Double-A Mississippi.
Mark Bowman is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.