Knee surgery for Zobrist

The A’s will be without their most versatile player for possibly four to six weeks. Ben Zobrist will have left knee surgery to trim a torn meniscus.

Zobrist has started five games in left field, five at second and two in right. He was the designated hitter Friday after missing four starts, a test to determine whether he could play through the injury. He couldn’t, feeling too much pain and weakness to perform.

“I wasn’t getting out of the box well at all,” Zobrist said. “Frankly, the worst thing was trying to swing. I put a lot of pressure on the knee and didn’t feel I was in any kind of position I need to be.

“I wasn’t close enough to 100 percent to keep trying to do this for five or six months until the offseason.”

Zobrist was hurt Sunday in Kansas City, jamming the knee to the ground while sliding into second base. He underwent right knee surgery after the 2005 season. Muncy’s time: The A’s called up infielder Max Muncy from Triple-A Nashville, and he got his first big-league hit, a seventh-inning liner to center — followed by a hard slide break- ing up a double play — that ignited a three-run rally. He played third base despite playing just one game at that position for Nashville.

He got the call after 1:30 a.m. and slept for an hour before flying to Oakland.

“Probably same thing everybody else says when they get called up here,” Muncy said. “Dream come true.”

Tyler Ladendorf, who made the season-opening roster, was unavailable to be called up because of an injury. To clear a spot on the 40-man roster, lefty Eury De La Rosa was designated for assignment. Old remedy: Jesse Hahn, who missed a start with a blister on his right middle finger, will throw a bullpen session Sunday or Monday. If he’s OK, he’ll probably start Wednesday. Hahn said he’s feeling better, and it helps that he soaks his finger in pickle juice, an old trick once used by Nolan Ryan to avoid blisters.