Hamburg sports director Jens Todt has told the agent of Jann-Fiete Arp to call them.
"His agent knows we're ready to discuss 24 hours a day," Todt told Bild.
The 17 year-old striker is tied to HSV until 2019 - and the Bundesliga outfit are eager to upgrade the deal.
Earlier this year, Arp revealed interest from Chelsea - though was cool on joining the London giants over fears he'd "get lost in the system".
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