PHOENIX -- A day after D-backs shortstop Willie Bloomquist was scratched before Thursday's 6-3 win against the Pirates with back stiffness, the veteran infielder had an MRI exam that showed no structural damage.

The 34-year-old missed six consecutive games last week with a back injury before playing two games in Pittsburgh and thinking the ordeal was behind him.

"I sound like a broken record, one minute it'll feel fine, the next it's bad," Bloomquist said on Friday. "If I give you an answer it could be different a half hour from now. I don't know why I feel like I'm ready to play, then when I get up I feel like I can't for a week and a half. It's weird. I thought we were turning a corner for a while and it was feeling good then it started again."

The most frustrating part for Bloomquist is he doesn't exactly know what he is up against.

"It's a mystery," he said. "You don't know what you can expect from it day to day. It puts everybody in a bind. It's not like a broken bone, where you know you're going to be out 3-4 weeks, it could be tomorrow or it could be a few days. It's frustrating."

The uncertainty of the injury has forced the D-backs to consider placing Bloomquist on disabled list stint, but for now they'll play it by ear.

"We've talked about it for sure, but we'll try to go for the day to day," D-backs manager Kirk Gibson said. "He's actually a lot better today than he was yesterday. He wants to play, he wants to be there for his teammates."

Gibson wasn't sure if Bloomquist would be available off the bench on Friday against the Nationals.

"I don't know," he said. "We'll work on him some more. So he could be, yeah. There are some techniques that have worked on his back before."

Ulcers send Collmenter to DL

PHOENIX -- The D-backs placed right-handed relief pitcher Josh Collmenter on the 15-day disabled list Friday with ulcers and recalled right-handed reliever Brad Bergesen from Triple-A Reno.

Coming home from a 10-day road trip on Thursday, D-backs manager Kirk Gibson said Collmenter became ill as soon as he got off the plane.

"It cropped up last night," Gibson said. "It's kind of a personal thing. It's legitimate. It happened off the plane. He went home and got very, very sick."

Collmenter was 3-3 with a 4.24 ERA in 22 games (nine starts) with the D-backs in 2012. In his last 18 games, he went 3-1 with a 2.41 ERA.

Bergesen, claimed from the Orioles on July 20 off waivers, tossed 3 2/3 scoreless innings in his only start with Reno on Aug. 5 at Iowa. He also made three relief appearances with the D-backs this season and allowed one run in five innings before being optioned on Aug. 1.

Blanco out at least six weeks

PHOENIX -- Two days after undergoing surgery on his left thumb, D-backs catcher Henry Blanco said Friday that the procedure went as planned and he will miss at least six weeks before deciding the next course of action.

The 40-year-old tore a ligament in his thumb in Sunday's game against the Phillies. He flew back to Phoenix on Monday for an MRI exam and to be seen by hand specialist Don Sheridan before having surgery.

"Everything went well," Blanco said. "I'll sit out six weeks, I believe, and we'll see after that. This is how it is, and I have to wait six weeks and see how it comes out."

The D-backs claimed veteran Wil Nieves off waivers on Monday to take Blanco's place as the backup catcher behind Miguel Montero.

Blanco is batting .188 with one home run and seven RBIs in 21 games played.

Whether Blanco attempts to come back this season depends on how much his thumb has healed when the cast comes off.

"We'll see. I want to and I hope so, but we'll see," he said. "I knew right away it was hurt, but in that situation you are hoping nothing is wrong.

Saito gives Corbin momento for first win

PHOENIX -- Coming into the clubhouse Friday, D-backs pitcher Patrick Corbin received a golden surprise in his locker.

Inside a shoe box was a golden glove commemorating the rookie's first career Major League victory earlier this season against the Marlins.

The giver of the gift was none other than fellow D-backs pitcher Takashi Saito.

"That was really nice of him," Corbin said. "That's the type of guy he is. That's why everybody here loves him."

There was just one problem with the present, however, the date was printed wrong. On the inside of the glove in black letters read March 30, 2012. In reality though, Corbin's first win came exactly a month later on April 30.

So appreciative of the gift regardless of the typo, Corbin didn't have the heart to tell Saito of the mistake.

"I didn't want to tell him, that was really cool of him to do," Corbin said. "It's pretty neat, he said he got it for me a while ago.

Friday wasn't the first time Saito generously gave Corbin something, either. In Spring Training the veteran reliever presented the rookie with a couple suits to wear on road trips.

"It was really nice of him to do it," Corbin said. "He's a great guy."