After his at-bat in the second, Montero told Maddon that he couldn't continue.
Taylor Teagarden, promoted from Triple-A Iowa on July 4 when David Ross went on the seven-day disabled list with a concussion, took over the catching duties on Saturday and went 0-for-3.
Ross was eligible to come off the DL on Friday, and the Cubs said they wanted to wait until after the All-Star break to activate him but may be forced to have the veteran available.
"We have to figure out the backup," Maddon said of Sunday's game.
Teagarden will be the starting catcher on Sunday against the White Sox in the final game before the All-Star break.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings. You can follow her on Twitter @CarrieMuskat and listen to her podcast. This story was not subject to the approval of Major League Baseball or its clubs.