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08/24/12 9:13 PM ET

Bloomquist remains on DL with back stiffness

PHOENIX -- D-backs infielder Willie Bloomquist felt stiffness in his back Thursday while playing in an Arizona League game and was consequentially not activated from the 15-day disabled list Friday, the first day he was eligible to come off of it.

The club placed the 34-year-old on the DL with a strained lower back on Aug. 11, retroactive to Aug. 9.

"He didn't feel that good last night when he played," manager Kirk Gibson said. "It's not bad like it was, but he's not stiff-free. I'm not going to rush him back when he's played a minimal amount. Just didn't feel good after that."

Bloomquist went 1-for-3 with a triple and three RBIs in his first rehab game Thursday.

Before the injury, Bloomquist was having a career season with the D-backs, batting .300 and scoring 46 runs.

In his absence, the club has used mostly rookie Jake Elmore at shortstop with veteran John McDonald backing him up after the trade of Stephen Drew to Oakland.

Gibson says D-backs will try six-man rotation

PHOENIX -- Two days after the impressive Major League debut of Tyler Skaggs, D-backs manager Kirk Gibson announced Friday the club will go with six starting pitchers, at least for the next turn through the rotation.

"For now, that's what our plan is," Gibson said. "As it stands, we'll have six starters. Things could change but we've sat and talked and made a decision as on organization."

Skaggs, a 21-year-old lefty, tossed 6 2/3 innings Wednesday, allowing just two runs on three hits in a 3-2 win over the Marlins.

"I'm just happy to be here, honestly. I'm comfortable with whatever they want me to do," Skaggs said. "It's been great, unbelievable, nothing to complain about. I've just been trying to soak it in."

The rest of the rotation -- consisting of Patrick Corbin, Ian Kennedy, Trevor Cahill, Joe Saunders and Wade Miley -- will remain intact with Skaggs being added to the back end.

One of the reasons Gibson listed for making the move was to give his arms more rest during the team's current stretch of 23 games in 23 days. Another reason was to get Skaggs more experience in the big leagues after he dominated in the Minors.

"It can be very beneficial," Gibson said. "We've talked about that with everybody. The time you get up here is beneficial. You can monitor everything."

With the addition of Skaggs, the D-backs' rotation now consists of four lefties and two righties, something of an abnormality for most teams.

"It's unusual, I will say that, but we're trying to win ballgames. I think we believe that certain people deserve a chance to continue on their development and help us win ballgames," Gibson said. "We'll try to mesh it all together. The lefties have done a good job of pitching to righties so far."

Once the D-backs get into mid-September, they'll have four off-days over a two-week stretch, making a six-man rotation less applicable. But whatever the club decides to do moving forward, the starters will need to find different ways to work with more time off in between outings.

"There are a lot of options, you might throw a longer bullpen, a shorter bullpen, or on flat ground. There are different ways to go about it and stay fresh," Saunders said. "Just do what feels right. If they think that's what is best, I'm all for it."

Upton rests again, dismisses waivers report

PHOENIX -- On the same day that a CBSSports.com report said D-backs outfielder Justin Upton was claimed off waivers, the 24-year-old was not in the lineup for the third consecutive game Friday due to a nagging hamstring injury.

Upton hurt his left hamstring while running the bases Tuesday and was forced to leave the game after the first inning with tightness.

"We're going to give him another day," manager Kirk Gibson said. "I knew what he did, I saw it happen, I think there needs to be more comfort."

Upton went through conditioning drills early Friday afternoon and reported afterward that he felt fine. The outfielder even tried to convince his manager to play him, but the effort was fruitless.

"It didn't go well, they had already made their mind up," Upton said. "It's just gotten better day by day. It was just tightness, that's the word everybody likes to use. It's good to go now."

As for him getting claimed off waivers, Upton brushed off the report with little concern past the initial shock value.

"It surprised me a little bit, but it's nothing," Upton said. "If it's important, somebody will tell me. But it's nothing."

Tyler Emerick is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.