Estevao struck five minutes into injury-time as Chelsea won 2-1 on the night.
"Oh wow," Estevao said, taking a deep exhale of breath as his smile grows wider. "I’m just so, so happy.
"I’m grateful to God, to my family, to all my team-mates, to the coaching staff and to everyone else at the club who has helped me with my football here.
"It’s an amazing feeling to score my first Premier League goal and in such a big game, I’m just so happy."
Estevao also stated:
"I feel great right now and it’s so good that the manager has so much confidence in me," added the teenager.
"When I went on, he told me to just play my own game and to try and make an impact. He told me to try and score or create a goal and thankfully I managed to do that.
"I’m so happy for him and for all the belief that the manager, Enzo Maresca, has in me."
Better than I could imagine
On his first months as a Blue, Estevao added: "Things at Chelsea have gone a lot better so far than I maybe imagined. I feel so good in training every day and I enjoy every moment.
"I have fantastic team-mates and coaching staff around me that help me each day, and it’s very helpful that I have my family with me and they’ve helped me really settle into life in England and the Premier League.
"I couldn’t be happier!"