At this point, I am not too worried about this. Hard to know how bad this might be, so no need to worry until there is something to worry about.
It definitely hurts some that he will miss training camp. That is the time to learn the schemes, get used to playing as a team. He will now have to learn that mid season, on the fly. Not the end of the world, he is a vet, seems like a smart player, but this is a real issue. It takes time for a new player to integrate into a core rotation. I assume he will still watch and learn which will help some this will delay him not just in terms of the injury but also the integration.