Zieler joined for £2.6million from Hannover last summer but has grown frustrated with his lack of opportunities and is weighing up a return to Germany.
Leicester, who will appoint Michael Appleton as assistant to Craig Shakespeare today, are looking to sign Jakupovic for £1.7million though Watford manager Marco Silva is also an admirer of the Swiss international who did well for him at Hull.
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!