Tolzien is lined up to make his first career start for the Packers on Sunday against the New York Giants, standing in for injured duo Aaron Rodgers and Seneca Wallace.
The former University of Wisconsin man threw for 280 yards, one touchdown and two interceptions in the loss against the Philadelphia Eagles last weekend, having replaced Wallace in the first quarter.
Nelson told Packers.com: The way Scott came in and just controlled the huddle; he was very confident in the way he spoke.
"If he was just lying to us the way he was speaking, or if he was just trying to put off a good vibe, he was very confident.
"He knows his stuff. We see the work he puts in. When you see a guy grinding like he does every day, you know he's going to be prepared."
The Packers currently sit in third in the NFC North, but still maintain hopes of a playoff spot.