Mariano Rivera's visit with surgeons yesterday was expected to result in a date for surgery to repair a torn right ACL.

However, things didn't go as smoothly as expected.

"We ran into complications,'' agent Fernando Cuza told The Post. "I am referring to Dr. Ahmad and [Yankees general manager] Brian Cashman for further information.''

Neither Cuza nor the Yankees would elaborate on what was discovered when Rivera met with Yankees 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.