From the Atlanta Journal-Constitution:

The Braves optioned struggling center fielder Nate McLouth to Triple-A Gwinnett on Tuesday...General manager Frank Wren told AJC reporter Carroll Rogers that the club has activated Brent Clevlen from his rehabilitation assignment with Gwinnett...Braves manager Bobby Cox held struggling McLouth out of the starting lineup for Sunday’s game before using him as a late replacement. He has failed to produce in his return from the disabled list and done little to show the Braves that he’s the answer for center field down the stretch. They have been keeping a close eye on McLouth as the July 31 trading deadline approaches.