Chelsea are pursuing a deal for Hamburg whizkid Jann-Fiete Arp.
He was offered the chance to move to Stamford Bridge in the summer but decided against the move as he wanted to gain more experience and Chelsea stepped back.
Hamburg president Heribert Bruchhagen previously ruled out a departure.
"He will stay with us. His advisor Jürgen Milewski has promised me and sporting director Jens Todt," Bruchhagen told Bild. "He will develop with us."