All I can find right now.....
From CBS Sports.com......
Knee injuries can obviously end up serious, so you should be a little concerned if you own Clark, one of QB Peyton Manning's favorite red-zone targets, in Fantasy. Don't panic just yet, though. He might not miss any time at all. He's more in the second tier of Fantasy tight ends than an elite option, but he deserves to start in all leagues when healthy. The Colts visit the Vikings in Week 2.
Not much, but like I said, all I can find right now.