Update Friday 5:45 EDT: Mariano Rivera answers one question, tweeting:
Thank you fans, friends and family for your prayers, well wishes and support. I will be ok. I will be back.
He also told reporters in Kansas City "I'm not going out like this." The under-covered part of this story is not the torn ACL but the addition of the meniscus damage, which Rivera originally knew about, but the Yankees did not.