The Saints got the win thanks to several youngsters, who got valuable first team opportunities in the game.
Dan N'Lundulu got his first senior goal, and captain James Ward-Prowse sealed the 2-0 win with a late free kick.
Asked about the game and some of the youngsters who got debuts, Hasenhuttl told reporters: "We played against a League One team and it was a good moment for them to step into the team.
"We tried to give them the chance to show up and I think they did okay. They were a little bit nervous at the beginning but I think after five or 10 minutes you could see they really wanted to play.
"They had a clear plan of what we want to do, how we want to play and finally when Dan N'Lundulu scores it's good for the young lads. Caleb [Watts] did some good dribbling, [Jake] Vokins, it was not the first game for him but he's comfortable on the left side and Kegs [Chauke] after the first minutes was okay.
"He showed that he can play football and he's calm on the ball."
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