Braden has been wearing a neoprene guard to protect his big toe, which drags with his delivery.
The guard, however, caused a rash to develop on Braden's ankle. Geren said the rash isn't new -- it just hadn't become a problem until recently.
Asked earlier on Tuesday if Edgar Gonzalez could start if Braden isn't available, Geren said he'd weigh out all options. Gonzalez last pitched Sunday, throwing two shutout innings against Toronto.
"We might have to get someone else," he said. "Sacramento is close and they're at home."
That someone turned out to be Reineke. The 27-year-old is 5-4 with a 4.37 ERA in 24 games (16 starts) with the River Cats this season. He pitched in four games (three starts) with the Padres last season, going 2-1 with a 5.00 ERA in 18 innings.
Braden has struggled since the All-Star break. The 25-year-old has surrendered 20 runs in 24 1/3 innings (7.40 ERA) over four starts. He's 8-9 with a 3.89 ERA in 22 starts this season.
Adam Loberstein is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.