Sandy Alderson: Mets exploring external first-base options

NEW YORK -- The New York Mets intend to at least explore external options at first base with Lucas Duda sidelined for the foreseeable future with a stress fracture in his lower back.

"We're not ruling out anything externally," general manager Sandy Alderson told ESPN.com on Friday. "We'll continue to monitor what's available. We haven't at this point decided that we're just going to go with what we have."

Eric Campbell starts a fourth straight game at first base on Friday. Wilmer Flores should return soon from a minor-league rehab assignment and be available at the position.

The Atlanta Braves may be willing to entertain a trade for Kelly Johnson, while James Loney has an opt-out for a major league gig. He currently is playing for Triple-A El Paso in the San Diego Padres organization.

"It's doable," Alderson said. "The circumstances have to be right. Whether it's doable or not is one thing. Actually pursuing it and trying to identify something is something else."