Adrian has only conceded two goals in six games, and Demel believes he is being pushed on by Jussi Jaaskelainen behind him.
He told whufc.com: "Adrian is a very good goalkeeper, but I don't want people to forget that Jussi was outstanding last year. If Adrian plays well, people should know it's because he has Jussi in the back, who helped him to integrate.
"But yes, he's a good goalkeeper, we're happy for him and I'm sure that the West Ham fans will see a lot more from him. We're kind of lucky because we have two great goalkeepers."
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