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6/10/2014 2:20 A.M. ET

Fracture to sideline Cuddyer six to eight weeks

DENVER -- Manager Walt Weiss had said that outfielder Michael Cuddyer was making progress with his injured left shoulder before the team placed him on the 15-day disabled list on Monday. But clearly Weiss hadn't seen Cuddyer struggle with the simple task of putting on a shirt.

Following Monday's 3-1 loss to the Braves, Cuddyer, sporting a sling, revealed the true nature of his injury: a non-displaced fracture of his shoulder socket, which is expected to keep him out six to eight weeks but shouldn't require surgery.

Cuddyer missed three games after injuring the shoulder attempting to make a diving play at third in the ninth inning of Thursday's 12-7 loss to the D-backs. Weiss said that Cuddyer was available off the bench for the three-game weekend series against the Dodgers, but he did not make an appearance.

"Finishing that game was extremely painful," said Cuddyer. "I [gritted it out] the last inning, and they just kept hitting ground balls to me."

When Cuddyer was placed on the DL, Weiss hinted that the situation could be more severe than had been revealed.

"It's something that as a professional team we have to push through," said Cuddyer. "Nobody in the league is going to feel sorry for us."

Cuddyer, the 2013 National League batting champion, hit .317 with five home runs and 16 RBIs in 31 games this season. He previously missed a little more than four weeks with a strained left hamstring, an injury he sustained in mid-April.

With the Rockies now without both of their 2013 All-Star outfielders for an extended period of time -- Carlos Gonzalez is set to undergo exploratory surgery on his left index finger on Tuesday -- Drew Stubbs will likely become a lineup mainstay. Stubbs, who is batting .325, had been getting most of his at-bats against left-handers, but he started and batted second on Monday against Braves right-hander Gavin Floyd, going 0-for-4.

Outfielder Corey Dickerson -- who homered on Monday -- has already been playing regularly since Gonzalez went down, leaving Brandon Barnes, who has experience at all three outfield positions, the Rockies' sole outfielder off the bench.

Rockies place Butler on 15-day DL

DENVER -- The highly anticipated debut of right-hander Eddie Butler didn't go according to plan, and neither have the days since.

The Rockies announced on Monday that they've placed Butler on the 15-day disabled list with inflammation in his right rotator cuff.

"We're going to be cautious with a young pitcher like Eddie," said manager Walt Weiss. "He felt fine during his start but had some soreness the next day."

The Rockies will be replacing one former first-round pick with another. Per a Rockies source, 23-year-old left-hander Tyler Matzek will be called up from Triple-A to make his Major League debut on Wednesday against the Braves. An official announcement isn't expected until Tuesday; the club has not confirmed the move.

Matzek, the 11th overall selection in the 2009 Draft, has allowed 70 hits and struck out 61 over 66 2/3 innings for Colorado Springs this season.

In his own debut, last Friday against the Dodgers, Butler allowed six runs over 5 1/3 innings. The team doesn't think his injury is anything major, but they've clearly decided to play it safe, with Weiss calling it "a different type of soreness" than Butler has experienced in the past.

"There's no reason to push him, so we're going to give him some time to let that soreness go away," said Weiss. "Hopefully, it's not anything serious. We don't think it is right now."

Butler's move to the DL is retroactive to June 7. Assuming he only requires the minimum stint, he would be eligible to return on June 22 for the series finale against the visiting Brewers.

Worth noting

• The Rockies recalled right-hander Chad Bettis from Triple-A Colorado Springs on Monday to fill one of the two roster spots vacated by Cuddyer and Butler.

Weiss said that Bettis would be available out of the 'pen on Monday but that he plans to ease him in until he finds a role.

Bettis allowed 13 earned runs over 13 1/3 innings in previous stints with the Rockies this season.

"I think we're bringing him back at a good time," said Weiss. "He went down there and worked on a few things. Mentally, he feels real good where he's at."

• The Rockies designated right-hander Wilton Lopez for assignment on Monday to make room on the 40-man roster for right-hander Christian Bergman, who was promoted from Colorado Springs to make his Major League debut.

Lopez allowed eight earned runs and 18 hits over 6 1/3 innings before the Rockies optioned him to Triple-A on April 9. He didn't fare much better following his demotion, allowing 39 hits and 15 runs over 29 innings with the Sky Sox.

"Wilton could still end up with us; you've got to go throw the process," said Weiss. "We needed to create a spot; unfortunately, Wilton was the guy we needed to create a spot with."

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