Previously, TUI decided to split Hapag-Lloyd from the rest of the company to focus on tourism, giving in to pressure from large shareholders including Norwegian shipowner John Frederiksen.
TUI said it will divest Hapag-Lloyd via a spin-off, a merger or a sale to an investor. Media reports previously said NOL may offer as much as $6 billion to $7 billion for the world's fifth-biggest shipping line.
Financial Times Deutschland also cited Frederiksen's spokesman and confidant, Tor Olav Troim, as saying there are five or six parties interested in buying Hapag-Lloyd.