Mariano Rivera just said that the complication discovered Monday was a blood clot in his right calf. He doesnt believe its a significant problem and he has already taken steps to fix it.
There is still no date for the ACL surgery. Rivera actually has to strengthen the muscles around his knee and have full range of motion before he can have surgery. The blood
clot is not the reason he hasnt had surgery yet.
Rivera also said he was leaning toward coming back next season even before the injury.