Add David Wright to the list of injury concerns for the Mets.

The third baseman was diagnosed with a stress fracture in his back after an MRI exam Monday, stemming from a play at Citi Field against the Astros on April 19, when he dove and tagged Carlos Lee.

“Going into (the exam) I was preparing for Josh Johnson and the Marlins,” Wright said of Monday night’s opponent. “And coming out of that, my head was spinning.”

The Mets were getting a second opinion, but if the stress fracture is confirmed, Wright likely will be out for at least two weeks.

“It would be a nonsurgical course of treatment,” GM Sandy Alderson said. “According to the information we have now, it would be rest for the next 10 days or so [and then] a return to baseball activity. We’re not talking about something long-term, but we are talking about something that may require him to rest for a period of time.”

It’s just another issue for manager Terry Collins, who inserted Willie Harris at third base against Florida.

“I was shocked by it,” Collins said of the diagnosis. “[Wright] is, without a question, the face of this team. His presence in this lineup is something we need. We’re going to ask other guys to pick it up as of today. But I was shocked and unhappy.”

Wright said the injury is not the reason his average has plummeted to .226.

“I don’t think so,” Wright said. “This is not a cop-out or an excuse for what I’ve done so far. I played through it and if I take the field, I expect to perform a certain level. Thus far, I haven’t performed at that level, but I don’t think this injury is the reason I’ve gotten off to a slow start.”

Wright admitted he was “stubborn” in putting off the MRI exam.

“I still think if the risk wasn’t there, I could play through it,” Wright said.

The Mets also are without injured first baseman Ike Davis, who is expected to head to Port St. Lucie on Tuesday morning to begin rehabbing his sprained ankle.