The White Sox activated Brebbia (calf) from the 15-day injured list Monday.
Brebbia (calf) will begin a rehab assignment with Triple-A Charlotte on Friday, LaMond Pope of the Chicago Tribune reports.
Brebbia was placed on the 15-day injured list Monday with a left calf strain, retroactive to April 6.
Brebbia pitched a perfect ninth inning in Saturday's 7-6 extra-inning loss to the Tigers.
Brebbia (calf) went through fielding drills Wednesday, Daryl Van Schouwen of the Chicago Sun-Times reports.
Brebbia (calf) is scheduled to make a relief appearance Monday in a game at minor-league camp, Daryl Van Schouwen of the Chicago Sun-Times reports.
Brebbia (calf) will face hitters again Friday, Daryl Van Schouwen of the Chicago Sun-Times reports.
Brebbia (calf) is scheduled to face hitters in live batting practice Wednesday, Daryl Van Schouwen of the Chicago Sun-Times reports.
Brebbia (calf) is scheduled to throw a bullpen session Thursday, Daryl Van Schouwen of the Chicago Sun-Times reports.
Brebbia (calf) has been fitted with a walking boot and is getting around on a scooter, Vinnie Duber of AllCHGO.com reports.