The Dodgers won’t know for certain the extent of Ivan De Jesus’ oblique injury until an MRI is taken Monday, but manager Don Mattingly conceded any playing time missed greatly hampers an already-longshot bid for an Opening Day roster spot.

“It’s hard to compete when you can’t be out there,” said Mattingly. “With this type of injury, there’s not a lot you can do. If you lose eight to 10 days, how many days does it take just to get your timing back? Not a good time to get hurt. You could see it on his face last night. These guys know it hurts your chance.”

Hopefully it’s just a mild strain, but they don’t sound that optimistic.

In better news, Matt Guerrier sounds like he might be ready to go by the start of the season.

Mattingly had better news on reliever Matt Guerrier, who has been out a week with lower back pain. He said the right-hander has continued to improve and plans to throw off a mound Monday. If that goes well, he could face hitters in a simulated game Wednesday and might be game-ready by next weekend.

I’m starting to wonder if it might be better just to put him on the disabled list to start the season and take it slow.

The bullpen is very deep this year, so he would just be a middle reliever with this group anyway. Plus, the team would get extra time to evaluate a camp arm in actual games.

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Eight more players were cut from the Dodgers today, seven of whom were reassigned and one who was released.

The Dodgers made their second round of player cuts on Sunday, moving four pitchers and four position players out of the Major League clubhouse.

Left-handed pitcher Alberto Castillo was released. Reassigned to Minor League camp were these non-roster invitees: pitchers Ryan Tucker, Matt Chico and Will Savage; catchers Gorman Erickson and Matt Wallach; and infielders Lance Zawadzki and Jeff Baisley.

I actually wanted to see more of Gorman Erickson, but as with the last time, no real surprises.

MLB.com: Outfielder Jamie Hoffmann was claimed by the Rockies off waivers, which makes it unlikely the perennial sixth outfielder in the system will be back.

MLB.com: Remember Ronald Belisario? He wants back in.

Ronald Belisario, not seen by the Dodgers since 2010, is again working on obtaining a work visa that would allow him to return to the United States and compete for a Dodgers bullpen role next season.

General manager Ned Colletti wouldn’t characterize the odds of Belisario actually showing up at Camelback Ranch-Glendale in February, but he confirmed that the right-hander has been working with government officials to allow his return.

Everybody has wishes, I suppose.

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MLB.com: Logan White has been interviewed for the Astros vacant GM position.

The Astros have interviewed Dodgers assistant general manager Logan White for their vacant general manager position, a Major League Baseball source told MLB.com.

Just as Ned Colletti is about to be shown the door.

Los Angeles Times: Pat Gillick would have interest in being the president of baseball operations for the new owners.

Pat Gillick, one of the most successful executives in baseball history, said he would consider joining the Dodgers if a new owner wished to consider him.

Gillick said he has been approached by prospective bidders for the Dodgers but said he would not align with any potential ownership group. Once a new owner is selected — and if that new owner is interested — Gillick said he would consider a position as president of baseball operations.

It’s an upgrade, but his history is a bit spotty.

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MLB.com: Dodgers are in negotiations for minor league contracts with five players.

The Dodgers are in discussions with four non-roster players on Minor League contracts with invitations to Major League Spring Training — three of them pitchers — and are close to a deal with another.

The four are: Jose Ascanio, a right-handed reliever; Jeff Baisley, a corner infielder; Wil Ledezma, a left-handed reliever; and Shane Lindsay, a right-handed reliever.

A tentative agreement has been reached with Alberto Castillo, a 35-year-old left-hander from Cuba who had a 2.31 ERA in 17 games in 2011 for the D-backs, his eighth organization. He missed August with shoulder tendinitis.

Wil Ledezma had been rumored to be signing for a while now, but the rest are new and rather uninspiring, which is to be expected.

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True Blue LA: Eric Stephen wrote a great article about how risk aversion can end up being risky as well.

In order to get these five marginal upgrades in 2012, the Dodgers will pay something like $26.5 million in 2013 for a group of older players ($23 million if Rivera’s option is not exercised). We could be paying $13 million in 2013 for three hitters who hit a combined .257/.314/.369 in 2011. Keep in mind, this group includes two players who were so bad in 2011 they were designated for assignment and dumped by their original teams, and a pair of homer-prone pitchers who made opposing hitters look like All-Stars outside of their friendly home parks.

I get not wanting to dive into the deep waters of the free agent market. Long-term commitments can be scary, and carry with them a lot of risk. But sometimes too much risk aversion can leave you saddled with the equivalent of a superstar price tag without anything close to superstar production.

Perhaps after all the dust settles, I’ll look at how everything actually shook out, but what this replacement level player spree is costing the Dodgers in 2013 was an eye opener for me.