The Colorado Rockies added reinforcements as the major-league rosters expanded Wednesday, recalling infielder Chris Nelson from Triple-A and activating right-handed reliever Taylor Buchholz from the disabled list.

The Colorado Rockies have acquired reliever Manny Delcarmen along with cash considerations from the Boston Red Sox in exchange for Chris Balcom-Miller, a sixth-round pick in the 2009 draft who was pitching at low Class-A Asheville.

Clint Barmes will start at shortstop as Troy Tulowitzki sits out the Colorado Rockies series opener against the San Francisco Giants with a groin injury. Meanwhile, Ian Stewart goes to the disabled list with an rib cage injury.

Luis Ayala pitched effectively for the Montreal Expos and Washington Nationals from 2003-07, but has struggled the past three seasons and has bounced around, making stops in six organizations.

The Colorado Rockies move Clint Barmes to the bereavement list and Manuel Corpas to the disabled list to make room for two fresh arms, left-hander Franklin Morales and right-hander Samuel Deduno.

The move essentially eliminates any chance the left-hander had of returning to the Colorado Rockies when the rosters expand in September.

Rosters will expand to 40 players early next week, and with the recent spate of injuries in the Colorado Rockies bullpen, the team is certain to add a few players. Who might be among the September additions to the Rockies roster?

The Colorado Rockies have designated left-handed reliever Randy Flores for assignment and recalled infielder Jonathan Herrera, who gave the team a spark and settled into the starting second base job after his recall in late June.

Matt Reynolds, a 20th-round pick in the 2007 draft, will join the Colorado Rockies bullpen, taking the roster spot created by the release of Brad Hawpe.

Brad Hawpe pinch-hit in the seventh inning Wednesday against the Los Angeles Dodgers and singled in his final at-bat with the team. The Colorado Rockies release Hawpe after the game.

Ken Rosenthal of FoxSports.com reports via Twitter that Colorado Rockies outfielder Brad Hawpe has cleared waivers. The Rockies, who will need to add a reliever in the coming days, can now trade Hawpe to any team.

The Colorado Rockies on Tuesday recalled Jhoulys Chacin to take the rotation spot of Jeff Francis, who was placed on the disabled list Saturday and will be joined there by Taylor Buchholz.