The Gunners are right back in contention for a top-four finish after winning their last three Premier League games.
Arteta believes that Rosicky has the quality and experience to make the difference on a regular basis, following his match-winning brace at West Bromwich Albion last weekend.
He told the club's official website: "Credit to the lads, we defended well and the goalkeeper made some really good saves. We're delighted with the points.
"Tomas has got quality and he's got a change of rhythm in the middle of the park that makes a difference. The fact that he made a difference here is massive for us.
"Now we have to keep going and keep winning. We have three games at home now so let's focus on that."