The German again shone in victory over Southampton yesterday.
"First of all Lukas has 101 caps for Germany. In our job, once you get the ball every time at the right moment, when you want it, with the right quality of the pass, it is easier to adapt. So when a team plays as well as it did today, the adaptation is easy," said Wenger.
"When you have to fight, and then you are exposed to the real English game, it is much more difficult. He is physically strong and he is a fantastic finisher. I had a little hesitation today to play him at centre forward because I had played him only once there. He gives us a balance on the left and I didn't want to destroy that because he did well at Liverpool."