"He has some soreness," manager Jim Tracy said before Sunday's series finale with the Giants. "He will not travel with us. They are going to treat him, and once he gets to the point where he's able to get back up and begin a throwing program after treatment, we'll get him ramped back up and get some bullpen sessions with him."
Though Minor League seasons are winding down and there may be limited availability for rehab assignments if Sanchez takes longer than expected to recover, Tracy is eager to see more of Sanchez as the club shifts to an evaluation mode looking ahead to the 2013 season.
"Hopefully between now and season's end we'll get him back out there and get him pitching again," Tracy said.
Sanchez is 0-3 with a 9.53 ERA in three starts since joining the Rockies in a trade with the Royals for Colorado's Opening Day starter, Jeremy Guthrie.
Tracy also announced that third baseman Chris Nelson will be activated Monday before the Rockies begin a series with the Dodgers. Nelson joined the club in Colorado on Sunday after completing a rehab assignment. He has been on the DL since July 17 after the club discovered he experienced an irregular heartbeat.