He just got dropped in my dynasty league, presumably because of this news. How serious is this injury? The rotoworld blurb mentioned him being crossed off several teams list because of his knees...does this go back to college? Any Sooners around?
I just sat down in front of the computer after a couple of hours away, so I'm not aware of any new developments . . . yet. However, the team is saying that this is precautionary and that surgery may not even be necessary. Aside from the mild hamstring problem, the knees had been reported on as being sore, but in spite of that Kelly had stood out and looked good in camp. Dropping him seems premature at this point unless you're dealing with imminent roster cut downs and you're loaded at WR.
I have him in one dynasty league and will probably stash him on IR for a year just to see what develops if he starts the year on PUP or isn't practicing.
EDIT- Oops, I read a little farther and he did undergo the surgery. The worst part of this isn't so much the recovery time, it's that he's a rookie who's losing this optimal time to develop chemistry with Campbell and the offense. He's losing reps that will be hard to get back once the season starts.
We'll have to simply wait and see.