The German attacking midfielder put in a good display in the Champions League against RC Lens.
Havertz and his teammates strolled to a comfortable and very one-sided 6-0 win on Wednesday night.
Post-game, Arteta told reporters: “Yeah, scoring goals, playing well, participating in wins - those are positive attributes.
“You saw the reception of his teammates and the crowd being with him, singing his name in every positive action that he had is all good things to help him show he's a tremendous player."
He then added on Declan Rice: “He was superb today again. The consistency he has shown and the understanding of the game.
“The decision making all the time, then the timing he has to win the ball back and the speed he plays with when the ball is around him. I think he has been so good."