Marlins outfielder Chris Coghlan will be "out a while" after an MRI revealed a lower back strain, manager Mike Redmond said Tuesday.

It will be at least 15 days, he noted.

"I feel terrible for him because he was patient, he didn't get a ton of chances early and made the most of his playing time," Redmond said. "He was red hot, probably our best offensive player. It's been one thing after another this year. We get a couple of guys back and we lose a couple of guys.

"I know everybody's frustrated, especially him with how far he's come and the kind of year he was putting together. But at the same time, hopefully we get him feeling good and back on the field and he can finish the season strong."

Coghlan, the 2009 National League Rookie of the Year, was batting .277 with 10 RBI and 13 extra-base hits, including .338 with a .379 on-base percentage since the start of May. He started in center field Saturday at the Mets and was replaced after eight innings

On Sunday, Coghlan was placed on the 15-day disabled list with what the team called a right calf nerve irritation. However, an MRI in Miami Monday showed the problem was his back.