Manager Ned Yost decided to make Thursday a day off for Braun, who had been scheduled to have Friday off.
"He won't get Friday off now," Yost said. "He had a little stiffness in his Achilles and we banged him [Wednesday]. He feels better today; he feels a lot better today. He'll be ready to go tomorrow."
But the 24-year-old Braun, NL Rookie of the Year last season, will be at the ballpark on Thursday, though he won't be sitting on the bench with his Brewers teammates.
He has a photo shoot scheduled with Sports Illustrated, and he's supposed to be one of the rising stars featured on the cover of the magazine's baseball preview.
"He said he had a cover shot," Yost said. "That's why he's coming up here -- to do it."
Diamondbacks outfielder Justin Upton and Rockies shortstop Troy Tulowitzki will also be in the photo shot with Braun. Both play with clubs that train in Tucson.
Justice B. Hill is a senior writer for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.