JC Tretter snaps the ball to Aaron Rodgers Friday night as the Packers take on the Raiders. Tretter suffered a knee injury during the first half of the game and will miss multiple weeks. Credit: Mark Hoffman

By of the

Green Bay --- Running highlights from Mike McCarthy's Sunday news conference...

On injuries... Brad Jones had a quad; B.J. Raji had significant bicep injury; JC Tretter had a significant knee injury and will be out multiple weeks. ...Once the one's got out of the game, knee started bothering him. Bothered him at halftime.

On if Tretter is surgical... Talking to staff, more testing ahead. Don't have all the answers left.

On the plan at center... Way you deal with injuries will never change. Injuries are a personal issue. Feel bad for the individual. Seeing him on crutches, think of him coming in back in February. ...Hard part about it, what individual has to go through. This is the way the NFL is. Injuries part of our game. Unfortunate. Will not stop us.

On if temorary IR a possibility... JC not enough information; B.J. would say no.

On Corey Linsley.... Corey took all the snaps today. Obviously a rookie. I like his make-up. Needs the reps. His confidence will grow every day. He'll be ready for Kansas City.

On Linsley's smarts... Corey has a very good understanding of our offense. Won't change how we approach the game moving forward. Our game plan won't change. Feel good about it.

On Josh Boyd in for Raji... Getting back each and every week. Saw him come on late last season. Picked up where he left off. Obviously versatility along the defensive line is important. B.J. has been an anchor in there.

On Boyd over the nose... Wouldn't classify him as an end. He's more of a 3-technique and actually has done well on the nose. I think we'll be fine there.

On Guion... Letroy's getting better. Just left his workout in the Hutson Center. He's getting close; he's champing at the bit. It's a process.

On Mike Pennel, if he's ready.... Had some big-time plays vs Oakland, some games you see his youth. He's getting better.

On if Rodgers plays now vs KC... More concerned about evaluation of 75 players. Really come down to tomorrow's practice. See where we are. Want to work different combinations. We have to get our roster ready.

On Lang/Sitton at guard... You have to always train three centers. That will never change. Since 2006, the guards have always been trained at center. You do so much shotgun. Playing in the stadium we'll be playing in Week 1; communication that goes on, guards a big part of that.

On Derek Sherrod's progress.... Thought Derek got better. Derek took another step. Lane Taylor did good things. This will be a good week for everybody.

On if he's worried for Brad Jones in opener... Not today. Was told he will not be ready for Kansas City. We'll see.