Mariano Rivera returned to the Yankees clubhouse Wednesday and explained what complications he encountered when he he had his torn ACL checked out Monday.

The Yankees closer said it was a blood clot in his right calf.

"I'm feeling better now, though. They're taking care of it," Rivera said of the condition that is not expected to stop him from returning next season.

Rivera is on blood-thinning medication intended to dissolve the clot and said he is OK, though he was scared when he received the diagnosis. He needs to spend at least a week or two strengthening his knee before he has surgery to repair his torn anterior cruciate ligament, but said that would have been the case regardless of the blood clot.