SCOTTSDALE, Ariz. -- Non-roster right-handed reliever Mike McClendon, who pitched out of a tight situation on Sunday and has not given up a Cactus League run this spring, was one of six players the Rockies sent to Minor League camp on Monday.

McClendon has thrown just 3 2/3 innings. He replaced Jhoulys Chacin against the Giants on Sunday with a runner at second and two out in the fifth inning of a tie game and forced a fly ball to end the threat. McClendon is 5-0 with a 3.88 ERA in 35 Major League games 2010-12, all with the Brewers, and was brought in for relief depth.

Other sent down were outfield prospect Kent Matthes, first baseman Henry Wrigley, infielder Tommy Manzella and left-handed pitcher Nick Schmidt.

The Rockies are down to 46 players in camp, including 12 non-roster invitees, and must be down to 25 on the active roster by Opening Day.

CarGo sits out as he deals with cold

Outlook: CarGo looks to be 30-30 threat in 2013

SCOTTSDALE, Ariz. -- Rockies All-Star left fielder Carlos Gonzalez did not bring back his best hitting stroke when he returned to the club after participating with Venezuela in the World Baseball Classic. All he brought back was a nasty cold that he's still trying to shake.

Gonzalez is 0-for-8 with two walks, two RBIs and two runs scored in three games since coming back to the Rockies.

"I haven't felt very well since I got back, health-wise -- I have congestion in my body and my stomach," said Gonzalez, who was not in the lineup for Monday night's game against the Reds at Salt River Fields at Talking Stick. "But I'm trying to get back, feel better, take a lot of medicine and start recovering.

"Either way, I'm not wasting my time. I'm taking at-bats. I'm seeing pitches. That's all a part of Spring Training. Of course, I'll be ready to play in the season. We're already excited about Opening Day. The good part is we have something like 10 more games left. We can get work in, concentrate and be ready for first pitch. We all want to be 100 percent when that happens."

Volstad open to transitioning to bullpen role

SCOTTSDALE, Ariz. -- Non-roster right-hander Chris Volstad welcomed the news that he will be competing for a spot in the Rockies' bullpen.

Volstad, 26, is 0-0 with a 1.29 ERA over seven innings in three Cactus League games, although he did give up four runs in three innings in an exhibition game against Team USA's World Baseball Classic squad. But Volstad has thrown short stints in a Minor League game and in a "B" game. In the "B" game on Sunday against the White Sox, Volstad threw two scoreless innings and forced a double-play grounder.

The right-hander went 3-12 with a 6.31 ERA in 21 starts for the Cubs last year, and is 35-51 in his career with the Marlins and Cubs.

"Relief experience? Not much at all -- my very first game in the big leagues was out of the bullpen," said Volstad, who has started all 123 of his Major League appearances since that one in 2008. "But whatever it takes, I just want to pitch, be a part of the team, help the team. If that means being a long relief guy, I'm fine with that."

Volstad's pay will be based on a $1.5 million salary if or when he makes the Majors. He is part of a crowd of pitchers competing for three-to-four spots. They include righties Adam Ottavino, Edgar Escalona, Manny Corpas and Miguel Batista, and lefties Josh Outman and Danny Rosenbaum. Additionally, right-hander Tyler Chatwood could be in the middle relief mix if he does not make the rotation.