Iron manager Graham Alexander praised his side as they progressed to the last sixteen of the northern section of the Checkatrade Trophy.
Eight changes were made ahead of the game by the United chief but quality was replaced by quality as an Oliver Lancashire own goal and a debut strike from Jonathon Margetts sealed progression.
"Delighted. We made some changes and the players that came in were desperate for a game," he told The Iron PlayerHD.
"They've been knocking on the door of the first team and they've shown what they're about. We started the game really well, Shrewsbury grew into it a little bit.
"We're delighted to be through to the next round. Two goals. Clean sheet. I couldn't be happier tonight."
Both full backs were credited to the assists with Conor Townsend feeding the cross for the own goal in the first half, while it was Levi Sutton, making his first start, who provided Margett's second half goal.
"It's important that these boys work hard when they're not in the team," he continued.
"Whether it's injury or just out of the team, they have to make sure they're fitness levels are right. We know what Conor is great at - overlapping and using his abilities in the final third. It was fantastic play.
"It was great play from Levi for Jonny's goal - a great ball in. He was man of the match and deservedly so. He started the game very bright, defended well and his use of the ball was superb.
"He's a good young player and we want him to do well. I know he's known as a midfielder, but in pre-season we looked at him as a right back and with Jordan's injury it gives us another option with Wisey."
Jonny Margetts came off the bench for his first appearance in an Iron shirt and he connected to Sutton's cross for the second Scunthorpe goal midway through the second half.
"It was good to give him the opporunity tonight," he stated.
"He's been working hard to get in the team, but the form of the players is top notch and it's been difficult. He did what he does around the goal and he's poached a goal as well. It was a tough debut up against those two centre halves and he gave as good as he got.
"The strength of the squad is the most important to me. We were here to win tonight and we prepared properly. Every player showed that we wanted to win that game tonight and we did.
"It's about standards. Everytime you train, put that kit on and cross that white line, there's standards to be kept. The supporters here tonight wanted commitment for us to win the game."
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