Hamburg are optimistic of beating Arsenal to the signature of highly rated Polish teenager Krystian Bielik.
The Gunners are pushing forward in their bid for the Legia Warsaw starlet, with deal-fixer Dick Law travelling to Warsaw for further talks on Tuesday.
Sources close to the Polish club say that Legia are frustrated with how far away Arsenal's offers are from their €3.2 million asking price.
"Of course Arsenal are also interested but I don't think he is bluffing [about being interested in us]," Zinnbauer told Kicker. "Otherwise he didn't need to come to Hamburg.
"He is a really good boy who has very good build-up play. He would fit in perfectly with our philosophy."