Mariano Rivera's visit with surgeons Monday was expected to result in a date for knee surgery to repair a torn right ACL.
However, things didn't go as smoothly as expected for the Yankees closer.
"We ran into complications," agent Fernando Cuza said.
Neither Cuza nor the Yankees would elaborate on what was discovered when Rivera met with team physician Dr. Chris Ahmad, Dr. Russell Warren, the Giants' physician, and David Altchek, the Mets' doctor who performed surgery on Rivera's shoulder after the 2008 season.
It was suspected the surgeons would concur with last week's diagnosis in Kansas City that Rivera had a torn ACL and a torn meniscus and plans would be made for season-ending surgery.
"I won't comment on that right now," Yankees general manager Brian Cashman said. "He was at the Hospital for Special Surgery and saw Dr. Warren and then saw [Dr.] Ahmad. He was scheduled to see both."
By now the storyline of how Rivera suffered the injury is part of Yankee lore. Shagging batting practice fly balls at Kauffman Stadium Thursday night, Rivera crumbled to the warning track in center field holding his right knee.
The 42-year-old has vowed to return next year, saying he didn't want the shocking scene to be the final snapshot of his Hall of Fame career.