Sanchez was scheduled to start Wednesday against the Marlins, but Gibbons said he is dealing with body soreness. Scott Copeland will receive the start instead.
"He's a hardworking guy when he's out there -- there's zero finesse to him," Gibbons said, per MLB.com. "He's chopping up some innings, went the into the ninth the other day. He's got a little fatigue. Figured we can't afford to lose him, so back him off a start. He'll be good to go the next go-around."
Sanchez is 2-1 with a 2.57 ERA in his last four starts.