Captain America can toss aside his shield and attempt to become Iron Man.

David Wright is the latest Mets player questionable for Opening Day after tests in New York yesterday revealed the third baseman has a “moderate” left rib cage strain, an injury that surfaced while he was playing for Team USA in the World Baseball Classic.

Wright, nicknamed “Captain America” for his heroics during the WBC, will rest for the next three-to-five days and then determine what activities he can resume. He officially withdrew from Team USA yesterday. Wright joins Johan Santana, who is building up strength in his shoulder and hasn’t yet made his Grapefruit League debut, among the Mets’ sidelined.

After the Mets’ 5-2 exhibition victory over the Braves yesterday, manager Terry Collins said he probably shouldn’t expect to have Wright for the April 1 opener against the Padres at Citi Field.

“You saw what happened to Murph, I mean Murph’s been out a month,” Collins said, referring to Daniel Murphy, recovering from a similar injury. “Last year David had it, he missed a month. Jason Bay missed a month. I’m trying to be optimistic in knowing this kid is as tough as he is, but I’m sure that it will be two-to-three weeks.”

Collins said he will begin evaluating Justin Turner at third base. For the spring, Turner is batting .259 with five RBIs.

“I want to see Justin over there,” Collins said. “He’s shown that he can certainly hit at that level, so he’s going to go over there.”

Zack Lutz, Brandon Hicks and Brian Bixler also are possibilities.

“There will be a lot of guys getting some third-base time in,” Collins said.