With Jake Peavy out for several weeks with a rib fracture, the White Sox are counting on left-hander Hector Santiago in their rotation.

"He has done a good job for us," pitching coach Don Cooper said, acknowledging Santiago has gone back and forth from the rotation to the bullpen. "You don't want to do that, but sometimes it's necessary. We're comfortable with him starting, for sure. He's penciled in."

Santiago is scheduled to start Sunday against the A's' A.J. Griffin.

"When you lose a guy — and we've lost two (including Gavin Floyd) … " Cooper said. "Jake, let's say he's out five weeks. That's seven starts. And Gavin is out about 25 starts. That might equal about 210 innings. Other people have to man those innings."

Not auditioning, but … Cooper served as substitute manager Friday night as Robin Ventura missed his second straight game to attend the high school graduation of his daughter in California.

Cooper said he is content being a pitching coach, but he certainly would listen to an offer to manage in the big leagues.

"I have no aspirations for that; that's not my passion," Cooper said. "(But) I think I could do it. If somebody came to me and said: 'Hey, we would like you to be a manager,' then it would be in my mind."

Cooper's success working with pitchers over the years could make him an attractive candidate.