The agent for Mariano Rivera said that the evaluation Monday of the 42-year-old Yankees closer's injured knee did not go smoothly.

"We ran into complications," Fernando Cuza told the New York Post. "I am referring to Dr. (Christopher) Ahmad and (Yankees general manager) Brian Cashman for further information."

Ahmad, of New York Presbyterian Hospital, is the Yankees' team physician.

A high-ranking team official told ESPNNewYork.com Tuesday morning that he didn't believe the complications were serious, but he said the team was still gathering information.

Another team official, who wouldn't specify Rivera's "complication," told ESPNNewYork.com that the pitcher had not suffered a torn medial collateral ligament in addition to a torn ACL and damaged meniscus -- a significant revelation because when an athlete tears all three, orthopedic surgeons refer to it as "the terrible triad" -- generally a career-ending injury scenario.

"No surgery has been scheduled yet," Cashman said. "I think (Rivera) will be here tomorrow and will be able to talk you."