The Swede struck in today's early kickoff as the Gunners won 3-0.
Gyokeres said at the final whistle: "We came back and we wanted to do a better performance than the last game (at Liverpool), I think we did that so a great day.
"It feels amazing, just a great feeling to score and get the win as well.
"It feels great, the guys in the team have been amazing. It's been so easy to get into the group. But, of course, there is a bit of time where you have to settle in with everything around."
On playing with Ebere Eze and Noni Madueke, he said: "Those two are amazing in their positions, they always do something special. We definitely saw that today."
On Martin Zubimendi's stunning first of his first two goals: "I haven't seen him to that in training, to be fair, so it was good that he pulled that one out! The header as well, I was a bit surprised with that but great to see him score two."