The midfielder featured in their Capital One Cup win over West Bromwich Albion.
Wenger said: "He is a Pires type. He appears to be in the box without being noisy and appearing suddenly. When he is there, he finishes well.
"Thomas has that kind of quality that some midfielders have - not many. They have the timing to get in dangerous situations.
"When they have those dangerous situations, they are like snakes.
"They bite you to death because they don't miss their first touch. He is cool enough in front of goal and he finishes well."