According to Boston's new sports radio station(98.5 Sports Hub),Mayo has a sprained MCL and will be out 6-8 weeks. FWIW.
Greene had a huge game and I think Mayo will too. But seriously, I don't root for injuries but this helps us A LOT in our running game and Dustin Keller passing.
Here you go, it is kind of funny.................... http://forums.theganggreen.com/showthread.php?t=48164