The Braves purchased the contract of outfielder Reid Gorecki from Triple-A Gwinnett on Monday.
McLouth left Saturday's game against the Philadelphia Phillies after aggravating a hamstring injury that forced him to miss two games last week.
The Braves got McLouth on June 3 in a trade with the Pittsburgh Pirates. He is hitting .258 with 15 homers and 56 RBIs.
Gorecki was expected to join the team in time for Monday's game against the Arizona Diamondbacks. He was hitting .286 with nine home runs, 49 RBIs and 14 stolen bases for Gwinnett.