New information and guidance has been issued on holidays to the US, Spain, Jamaica, Vietnam, Cyprus, Madeira, Malta, Croatia, Tunisia, Italy, Goa, Sri Lanka and Thailand.
The German holiday giant said it was closely monitoring the situation around the world.
“Our holiday programme is experiencing some disruption due to local authority restrictions and Foreign Office (FCO) advice,” said Tui.
“We are proactively contacting all customers whose holidays are affected to discuss their options, including an amendment or full refund.”