Head coach Leslie Frazier told reporters: "I have not talked to the guys about the backup situation yet, we're going to go through that when we're done, but Christian is going to start.
"Just felt like, what I said earlier, trying to pick the guy you feel like would give you the best chance to be successful on Sunday, and we think that's Christian.
"I'm hoping he has a great game on Sunday that can lead us to victory and you move on from there. It's just like the rest of our season, just one game at a time for us right now."
The Vikings face the Dallas Cowboys tomorrow.