Lucroy has missed nearly two months since breaking his hand in an off-field accident on Memorial Day weekend. He rehabbed with the Class-A Wisconsin Timber Rattlers last weekend.
Kottaras had a red-hot start to the season, hitting three home runs in the first week, but has hit none since. He has a .209 batting average with 12 RBI in 58 games tjos season.
The Brewers also optioned infielder Jeff Bianchi to AAA Nashville and called up pitcher Jim Henderson. Henderson, a right-hander, has 15 saves this season as the Sounds' closer. He is a 10-year minor league veteran who has never made it to the majors prior to Thursday.