The Dane struck midway through the second-half for the 1-0 triumph against Newcastle United.
Dorgu said at the final whistle: "It was a good hit. I didn't know I could do that, but I was very happy to score my first goal in this stadium as well. It was amazing.
"I just took what he (Ruben Amorim) told me to work on my confidence and stuff. I think I did well today. I just looked at the ball, saw it drop, and I just hit it.
"I've been practicing in training, so I think that's what helped me."
United manager Ruben Amorim also said of Dorgu: "Really happy and also with Manuel Ugarte, who is struggling but today he did a very good job. I liked the way all the bench was living the game. I think everyone stepped up with that role of leadership and helped to win the game.
"First of all, the players spend every day with me. They know when I say something is from a good place. They know I will defend my players until the end but I am really honest and I think it is important the fans understand.
"I don't see any problem with that. He played in a different position today and played where he can make more mistakes and it is not so dangerous for the team and he can take more risks and that helped Patrick play well."