But he says Draxler can go if Schalke’s 45.5m euros (£38m) asking price is met.
“We know we’re not going to be able to keep Julian at Schalke forever,” Tonnies told Sport Bild magazine.
“It would do Draxler good to spend another year or two with us,” said Tonnies. “But if another club comes in for him, then we cannot block them. That would be unfair.
“I don’t think he wants to join Bayern Munich, though.”
Arsenal manager Arsene Wenger ruled out making a move for Draxler in the January transfer window.
Source: BBC Sport.