PHILADELPHIA - Mets third baseman David Wright is dealing with a new injury that will leave him on the disabled list for awhile longer.

Wright has been shut down with lower back pain. Though an MRI exam at the Hospital for Special Surgery on Thursday revealed no structural damage, the third baseman won't resume baseball activities until Monday at earliest, manager Terry Collins said.

A strained right hamstring sent Wright to the DL on April 15. He had made enough progress from the hamstring to begin a rehab assignment Saturday, Collins said. But back soreness slammed the brakes on that plan.

"It's a setback," general manager Sandy Alderson said. "We were happy that the MRI didn't show anything structural. There was no stress fracture, there was no stress reaction."

Wright's history of back issues prompted the Mets to adopt a conservative stance.

"That's why we brought him to New York and had him examined, just to make sure there wasn't anything serious given his previous history," Alderson said.

In 2011, Wright played through a stress fracture in his back and wound up missing more than two months.

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Alderson said rest and anti-inflammatory medication should be enough.

Collins downplayed the new injury after speaking with Wright. The two have already begun hashing out playing time for when Wright returns.

Said Collins: "It's not anything that's hugely major."

During their conversation, Collins said Wright insisted upon getting no special treatment, meaning that he prefers to play every day.

"When he's back, he wants to play like he always does," Collins said. "He's anxious to get back out here."

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With Wright out, second baseman Daniel Murphy has shifted to third base, with prospect Dilson Herrera manning second. Once Wright returns, the Mets intend to demote Herrera and move Murphy back to second.