SAN JOSE — Earthquakes forward Mark Sherrod could be out for up to six weeks after undergoing surgery to repair a meniscus tear in his right knee, coach Dominic Kinnear said Tuesday.

“We didn’t see that,” Kinnear said. “It was something in the rehab that happened after ACL surgery.”

San Jose sent a second-round draft pick to Orlando City FC in December for the 6-foot-3 target man who was listed as suffering from tendinitis of the knee during the preseason. Sherrod, 24, had surgery Wednesday.

The Quakes are down to one big forward in 6-3 Adam Jahn, who led the team with seven preseason goals. Veteran Steven Lenhart is recovering from a knee injury.

San Jose is in the process of getting a third goalkeeper to replace draftee Keasel Broome, who had a shoulder injury and was let go. “We’re not wanting to start the season with two” goalkeepers, Kinnear said.

Defenders Clarence Goodson and Jordan Stewart continued their rehabilitation from injuries and might not be available for the Major League Soccer season opener Saturday at FC Dallas. But designated player Innocent Emerghara of Switzerland said he will be ready if training continues to progress this week. “I don’t have something special in mind with a personal goal,” he said after returning to practice since suffering an upper body injury two weeks ago. “For me, it’s about working hard, every day doing my best and to improve my life. The personal goal doesn’t mean much if I am not doing the work every day.”