Medical experts will monitor air quality during the ATP Cup in Australia as bushfires rage close to the tournament's Sydney venue.
Measures have been taken to ensure the safety of players, staff and spectators in the Ken Rosewall Arena in Sydney's Olympic Tennis Centre.
The British team will play their group games at the venue, which will also host all knockout matches.
GB's opening tie against Bulgaria will start at 06:30 GMT on 3 January.
Some of the world's top players are due to take part in the new 24-nation men's team event, including Rafael Nadal and Novak Djokovic.