Wenger did not see their penalty incident but was pleased his players showed they could grind out a victory on the back of Monday's thumping 5-2 win at Reading.
He said: "They organised to stop us playing and they did that very well, especially in the middle of the park. We didn't find the same fluency going forward and it was much more a win because we wanted the result than because we dominated the game."
It earned Arsenal a third successive Barclays Premier League victory for the first time since March.
"It's good but it's not enough, you want more," said the Frenchman.
"I hope that gives us a bit more belief and confidence. We have a week to prepare for the next game and hopefully at home we can continue to win our games. It's an important part of the season now."