Pereira scored with a sublime free-kick in his senior debut as United defeated Ipswich Town 3-0 in the last round of the competition.
The 19-year-old is hoping for more of the same come Wednesday.
"I hope I get another opportunity and I hope I can show the manager and impress everyone in the stadium and my team-mates," Pereira told United Review.
"If a free-kick appears and you've been practising, you sometimes have a feeling you will score. You feel confident and it's a very good feeling when the ball goes in."I spend a lot of time practising them, but I also try to improve everything, not especially one thing. I practise my free-kicks, my shooting, my dribbling - everything."