Blanco has a left calf strain that he apparently suffered in Saturday's 9-8 win over the Marlins in Florida. He started at shortstop in that game and scored two runs.
"He said he tweaked it on Saturday, and last night it bothered him a little bit, so we just [put him on the disabled list] and we'll get Miles up here to replace a pitcher very soon," Cubs manager Lou Piniella said. "That gives us another infielder."
Miles has been rehabbing a hyperextended right elbow with Triple-A Iowa and is expected to arrive in Cincinnati on Wednesday. He could be activated for that game. The Cubs want to see how Gorzelanny does before sending one of their pitchers to the bullpen.
"[Miles] is starting to swing the bat better and is playing better, so let's hope he comes here and gives us a little bit of a spurt," Piniella said. Miles was hitting .203 in 46 games before he was sidelined and has been on the disabled list twice this season.
"What it amounts to is if we need him, we'll activate him," Piniella said of Miles.
Blanco wasn't too worried about the injury.
"It's just a little sore," Blanco said. "It's nothing to worry about."
As for Soto, he went 1-for-2 in his rehab outing Monday with Double-A Tennessee, played there again Tuesday and is scheduled for another game with the Smokies on Wednesday. Piniella had wanted Soto back with the Cubs as soon as Wednesday, and general manager Jim Hendry is with the Double-A team to watch the backstop.
"The feeling is he needs two more days," Piniella said.
The Cubs have dodged any problems with basically one catcher since Soto was injured July 11, sticking with Koyie Hill. However, they were a little anxious with Tuesday's rain and the possibility of a day-night doubleheader on Wednesday. Hill has already done that, missing only three innings of a day-night twin bill July 12 against St. Louis.
Carrie Muskat is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.