The Dutchman looked a threat throughout the match and gave the visitors the lead with 15 minutes left to play in their 2-0 win at the Emirates Stadium.
Afterwards, Stevens applauded Huntelaar's display and stated his importance to Die Knappen.
"[Klaas-Jan] Huntelaar is very important to us," said Stevens.
"He is a team player, but he also scores goals on top of that. He worked very hard as a team player and I consider that most important.
"I took him off because he was so tired – he ran a lot tonight."
Schalke host Arsenal in the reverse fixture in two weeks' time.