DENVER -- Reliever Sam Demel was placed on the 15-day disabled list on Tuesday with tendinitis in his right shoulder, and the team promoted Kam Mickolio from Triple-A Reno to take his place.

D-backs manager Kirk Gibson said that the team will put Demel on a strengthening program, and it is hoped that he will be able to come off the DL after 15 days.

"The doctors examined him," Gibson said. "But [they found] nothing alarming. I don't believe there's any MRIs scheduled."

Demel is 1-2 with a 1.72 ERA in 21 appearances this year, and he pitched back-to-back days eight times, including three days in a row at one point.

"He's been on and off with the shoulder," Gibson said. "I've had to watch his innings. He's been throwing the ball well, but I know the last outing he went out there, he was hurting, and that's not good at all to have him pitch that way."

With a day-night doubleheader scheduled for Tuesday, the team didn't feel it could risk being short an arm in the bullpen, so it decided to make a move.

Gutierrez has stiffness in right shoulder

DENVER -- Reliever Juan Gutierrez was forced to leave Tuesday afternoon's game with the Rockies due to stiffness in his right shoulder.

Gutierrez came on to start the sixth inning and allowed a walk and a single before catcher Henry Blanco went to the mound.

"I was warming up and my shoulder didn't feel good," Gutierrez said. "But I was thinking once I get warm I'd be all right. Henry came to me and said, 'Hey, you look weird. You got something hurt?' I told him, 'Yeah, I don't feel good.' [He said] 'You've got to tell them you don't feel good.'"

Gutierrez, who has a 5.40 ERA, will return to Phoenix to be examined by team doctors, but initial indications are that he will have to be placed on the disabled list.

"When I played catch in the morning I felt it, but I thought it was all right because we had the day off yesterday," Gutierrez said. "Maybe a little tight. But I thought it was going to loosen up."

Mickolio to get another shot in the 'pen

DENVER -- Kam Mickolio is hoping that his current stint with the D-backs lasts longer than his previous one.

The right-hander was recalled from Triple-A Reno on Tuesday to take the place of Sam Demel, who was placed on the 15-day disabled list with shoulder tendinitis.

Mickolio edged out Esmerling Vasquez for the final spot on the pitching staff during Spring Training, but lasted just 12 days and four appearances before being optioned to Reno in favor of Vasquez.

At the time, Mickolio had a 9.00 ERA and the club asked him to get more consistent with his offspeed pitches, something he said he has done during his time in Reno.

"I've been throwing a lot of [offspeed stuff]," Mickolio said. "I've been getting a lot of swings and misses off of changeups and getting a lot of contact on sliders. It's all been positive."

While in Reno, Mickolio was 1-3 with a 4.42 ERA.

Worth noting

• Shortstop Stephen Drew, who played in one of the two games on Tuesday, is still battling a sore groin. "Some days are good, some days are worse than others," Drew said. "Just play through it while it heals up. Nobody is 100 percent." Drew's abdomen injury, which caused him to miss the season's first five games, is almost a non-factor. "It's gotten a lot better," Drew said.

• Zach Duke is on target to be activated from the disabled list in time to start Saturday's game against the Astros. Duke broke his hand during Spring Training and has yet to pitch in the big leagues this year. He made his final rehab start for Triple-A Reno on Monday night. "I was able to repeat my release point and read swings. You know, pitching again," Duke said. "It was the most pitches I've thrown in six months now, so it's good to be out there, and I feel like I'm ready to give this team a good chance to win."