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6/19/2013 3:43 A.M. ET

Collmenter a commodity out of bullpen

PHOENIX -- D-backs right-hander Josh Collmenter seemed to be the perfect choice to start in place of Tyler Skaggs on Tuesday night, but manager Kirk Gibson felt he was too valuable in his current role.

Collmenter has been invaluable as the long man out of the bullpen, as three times this year he has thrown three or more innings.

On April 3, Collmenter threw five innings of relief in a 16-inning D-backs win, saving the bullpen from being worn out.

On June 4, Collmenter threw four innings of relief against the Cardinals, as the D-backs won in 14 innings.

"I always know that at any point I could go in the game, so I'm always ready from the get-go," Collmenter said. "I always make sure I'm ready from pitch one just in case something freak happens, something crazy."

A lot of times if a pitcher has not thrown multiple innings he will need time to build up his pitch count before he can throw four or five innings.

Not Collmenter.

"I'm not sure what that's from," he said. "I don't know if it's just the way my arm is, or how I throw if that feeds into it. But I've heard from other guys that they couldn't do that, that they'd have to work into that. I think it's something special that I'm able to do that. I just like to stay prepared every day, whether it's conditioning or lifting, or just making sure my arm is ready to go, because that's the one thing about the bullpen, you can throw any day."

Brewer made strong impression with Gibson, Nagy

PHOENIX -- When he got the news that he was headed back to Triple-A Reno, right-hander Charles Brewer shook hands with manager Kirk Gibson and pitching coach Charles Nagy.

"He's very confident, you guys know that," Gibson said. "He's not pouting about it, he just knows it's part of his journey to be up here and have a huge impact on our success. He's got a great attitude about it."

The move was necessitated when Randall Delgado was called up to start Tuesday's game against the Marlins. Delgado didn't get a decision in the 3-2 walk-off win, but pitched seven strong innings with six strikeouts.

Brewer, a starter in the Minors, was brought up on June 9 to help bolster a depleted bullpen. He made two appearances and did not allow a run in 3 2/3 innings.

"We both agreed that his second outing was better than his first," Gibson said of he and Nagy. "He located the ball much better in the second outing, his breaking ball was much better in the second outing. He learned a lot, he observed a lot and he understands what he has to do to get guys out up here."

If nothing else, Brewer's stint in the big leagues helped position himself for a call up later this year should a need for pitching arise.

"He's smart enough to know that there's going to be other moves throughout the end of the season," Gibson said.

Putz getting ready to start rehab assignment

PHOENIX -- D-backs reliever J.J. Putz left the team to join Triple-A Reno on Tuesday to begin an injury rehabilitation assignment.

Putz, who has been on the disabled list with a strained elbow since May 8, is scheduled to pitch for Reno on Thursday and Saturday.

If that goes well, Putz would then throw in back-to-back games Monday and Tuesday.

"We do want him to be able to throw back-to-back days when he comes back," D-backs manager Kirk Gibson said.

Heath Bell has filled in at closer during Putz's absence, and has saved 11 games in the interim and 12 overall.

Gibson was asked how Putz would be worked back into the bullpen mix when he returns.

"We'll get him back-to-back and see how he's feeling," Gibson said. "We're going to wait and see how he's throwing, how healthy he is, and we'll see what else is going on in our bullpen as well. I think right now our focus is on getting him healthy and making sure he's ready to pitch here."

Steve Gilbert is a reporter for MLB.com. Read his blog, Inside the D-backs, and follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.