Leno admits he looked up to the Gunners hero when playing for VfB Stuttgart.
He wrote for arsenal.com: "It was at Stuttgart that I first met Jens Lehmann. When I was a child, Iker Casillas was always my idol but there was something about the way that Jens worked. I watched so many of his training sessions and even had some training sessions with him when I was about 16 or 17 years old.
"He would have been about 40 back then but for me, it was still very exciting.
"I remember idolising him and Timo Hildebrand too, but seeing Jens close up was something else. He was so concentrated, so professional and that's the mentality that you need as a professional goalkeeper. I enjoyed training with him because he was so good, so experienced and gave me many, many tips on how to improve."