The latest from Stoops, courtesy of Tulsa World:
And some more from ESPN's Tim Griffin:
"A lot of it depends on how he heals and how he's feeling," Stoops said. "It will be a while."
ESPN's Joe Schad reported Sunday evening that two people close to the situation said that Bradford had already begun physical rehabilitation and was hoping to be able to recover without surgery.
Again, a grade two or three sprain means there's probably some sort of bruising or contusion visible on the shoulder and it's more serious than Sam just being out for a week or two. If it's a Grade 2 sprain, Sam will probably play again this season. If it's a Grade 3 sprain, we might be seeing a lot more of Landry Jones. For more on the type of injury, read this post, or this post (keeping in mind it might be more than 2-4 weeks with this latest news). Here's another good summary of AC Joint sprains from our SBNation USC blog - Conquest Chronicles.
Stoops also said more on Gresham's status will be learned later this week.