Legendary former Arsenal goalkeeper Jens Lehmann has now revealed that he is baffled by one decision Mikel Arteta made this season. Mikel Arteta has made plenty of contentious calls in his time as Arsenal manager. The Spanish coach put his neck on the line when he forced big name stars such as Mesut Ozil and Pierre-Emerick Aubameyang out of the first-team picture at the Emirates Stadium. He has also made gambles in the transfer market, paying out big fees for the likes of Ben White and Kai Havertz, who both had their doubters when they first made the switch to North London. Havertz was even de…