Great Britain may not be able to rely on talismanic Scotsman Andy Murray when they defend their Davis Cup title in 2016.
Murray won 11 of his 12 rubbers in the tournament, including the second last singles rubber of the final against David Goffin, to guide Britain to a tenth title over-all and the first in 79 years.
Competing in the Davis Cup is always taxing for those involved, and the addition of the Olympic Games into the 2016 calendar may make it impossible for Murray to compete.
"The timing is really what's the issue because the players, they put so much effort into the grand slams, the Davis Cup comes immediately after them, you're pretty tired at the end of the slams," Murray told Reuters.
"Most of the top players are going right through to the end of the majors. Slams are stressful, they're draining, physically and mentally. I think that's where the issue is a little bit.”
Great Britain start their title defence at home to Japan in March. Murray is likely to be available for this opening encounter, but it is unlikely he will play a part thereafter.
Slovenian born Aljaz Bedene is tipped to replace Murray, if he is cleared to play, after several promising performance in 2015.