GREEN BAY, Wis. — As if figuring out how to slow down Vikings running back Adrian Peterson wasn’t tough enough, the Green Bay Packers must prepare for two unique variables when they visit Minnesota this weekend.

The Vikings are opening a sparkling new stadium when they host the Packers. They’re also trying to keep mum about who will be playing quarterback on Sunday night.

It could be Shaun Hill. It could be Sam Bradford.

“We’ve taken the approach that we could see either one of the quarterbacks. My understanding is that it’s probably going to be Sam Bradford, but I have a lot of respect for Shaun Hill,” Packers coach Mike McCarthy said Wednesday.

Vikings coach Mike Zimmer had other ideas.

“You’ll have to wait until Sunday,” he told reporters in Minneapolis.

Let the mind games begin between these longtime NFC North rivals . Even Peterson got in on the fun.