Holy crap, he's out for the season.... Sorry to hear that. I didn't think it would be that serious. I should know better than to take a team's word on injuries.
It was odd that they said his knee "buckled," and yet they reported that he had a "strain." A knee doesn't buckle from a strain. It takes some major structural damage (ligaments, not tendons). It wouldn't surprise me at this point to find out that he also has ligament damage. I hate to see players get injured.
On the bright side, at least it is early so they have time to make some adjustments.