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09/19/12 10:23 PM ET

Jacobs, Pollock called up from Triple-A Reno

PHOENIX -- The D-backs added outfielder A.J. Pollock and first baseman Mike Jacobs to the roster, after Reno captured the Triple-A championship on Tuesday night.

This will be Pollock's fifth stint in the big leagues this year. He filled in twice for players on paternity leave, served as the 26th man for a day-night doubleheader and also was up in April when outfielder Chris Young injured his shoulder.

Pollock hit .250 in those stints, as well as hitting .318 for Reno.

Jacobs returns to the big leagues for the first time since 2010, when he made 28 plate appearances for the Mets. The 31-year-old's best season was in 2008, when he hit 38 homers and drove in 93 runs for the Marlins.

Jacobs was suspended for 50 games last year after testing positive for human growth hormone. At the time, he was with the Rockies' Triple-A affiliate.

Jacobs hit .279 with 18 homers and 60 RBIs for Reno this season and served as a mentor for some of the team's younger players.

"I'm grateful for the opportunity," Jacobs said. "It's been a long time. It just feels good, it feels really good. I'm excited about it."

The D-backs would like to bring Jacobs back in 2013, but will face a 40-man roster crunch this offseason.

"We've got some kids that we've got to add onto the roster, and we've got some guys on the 60-day [disabled list], but I think it's a need," Towers said of the left-handed power Jacobs offers. "We've got Ryan Wheeler, but it'd be nice to have another left-handed power bat. I think he has interest in staying in the organization. We'll see what happens."

D-backs decide not to promote Bauer from Triple-A

PHOENIX -- In the end, the D-backs decided not to recall right-hander Trevor Bauer after Reno won the Triple-A Championship on Tuesday night.

Both general manager Kevin Towers and manager Kirk Gibson denied that the Bauer's 17 walks in three Triple-A playoff starts had anything to do with the decision not to promote him.

Instead, they cited his innings total and the fact that they did not want to go to a six-man rotation or take one of their other starters out of the rotation for Bauer.

Bauer threw 130 1/3 innings during the Minor League season, 16 1/3 in four big league starts and another 16 1/3 during the Triple-A playoffs.

During both his time in the big leagues and the Minors, the D-backs spoke to Bauer, the No. 3 overall pick in the 2011 First-Year Player Draft, about possibly cutting back a bit on his intense throwing program. Bauer's velocity appeared to be down during the Triple-A Championship game.

"You're going to need those extra bullets late in the season and look at where you're velocity is now, compared to April or May," Towers said. "That could be fatigue. And what causes fatigue? Those are only questions that he can answer for himself."

In addition, the D-backs would like Bauer to be more efficient with his pitches.

"I still think fastball command needs to improve," Towers said. "I think we saw that last night. I think he needs to trust his fastball a little bit more, he likes to go to his secondary stuff. I think he's still a little strikeout happy.

"I talked to him a little bit about that last night. Just reflect on the season, be positive, [think about] things that you think you may change that would keep you more ready every fifth day. I think it's really going to have to come from him. He's the type of kid that I think he feels pretty strong about the way he goes about doing things. I think he realizes now, after a full Minor League season, pitching every fifth day is different than it was in college."

Towers said that Bauer was likely to be named the organization's Pitcher of the Year, after going 12-2 during the regular season for Double-A Mobile and Triple-A Reno.

Worth noting

• D-backs manager Kirk Gibson said that outfielder Chris Young would be available to pinch-hit on Wednesday against the Padres. Young re-aggravated his right quadriceps in the first inning of Tuesday's game. An MRI taken Wednesday did not show any additional damage. Gibson said he would likely pinch-run for Young if he got on base.

• To make room on the 40-man roster for Jacobs, the D-backs designated outfielder Cole Gillespie for assignment.

• Double-A Mobile manager Turner Ward will be with the D-backs for the rest of the season, helping out before games. Ward's teams have won the past two Southern League championships.

Steve Gilbert is a reporter for MLB.com. Follow him on Twitter @SteveGilbertMLB. This story was not subject to the approval of Major League Baseball or its clubs.