"It was a tough game, we had lots of chances in the first half but we didn't manage to score them," said Havertz. "They are a good team, fair play to them. In the end, we are happy with the three points and three goals too.
"I haven't seen the replay but I think he touches me (for the penalty).
"I felt the contact and went down. For me it's a penalty. I said to the goalkeeper 'you touched me'."
He continued: "I just enjoy it on the pitch right now. It's so nice. I have so many good players behind me and I really enjoy the number nine role.
"We have two more games to play and we are going to give everything. We'll enjoy those games and see how it goes.
"I enjoy every second. He (Mikel Arteta) taught me so many things, especially at the start when it was tough for me. I'm so glad I was here. Things were hard at a the start but everyone stuck by me.
"I work hard but for me it's not easy to go into a new team. Sometimes I'm a shy guy.
"To go into a new team with a new manager and different players then it can be tough. I came from Chelsea and that didn't make it easy too. The manager has helped a lot and the players. The fans have been unbelievable.
"I needed maybe to change my game a bit. When I came form Germany I realised it's not easy to survive in this league. I had to adapt and I've done it well. I enjoy contact with my opponents and aerial duels too."
On Bukayo Saka, he added: "He's unbelievable and shows it every week.
"I think he's 21 or 22 and I've never seen a player like this.
"England are very lucky. He's hungry every day and if you see him in training he's special."