Belgium have confirmed that the 2015 Davis Cup final against Great Britain will be held indoors on clay at the 13,000-capacity Flanders Expo in Ghent.
Led by Andy Murray, Britain reached their first Davis Cup final since 1978 by beating Australia in the semi-final.
But the decision to play the final on clay on 27-29 November could mean Murray misses the World Tour Finals.
The Scot tweeted: "So Ghent on the clay for the Davis Cup final - very pumped! Think clay is a good surface for us."
World number three Murray, who has a good record on the surface this season, has put his participation at the World Tour Finals in doubt, saying he would need time to adjust from hard court to clay.
The end-of-season tournament for the world's top eight players finishes at London's O2 Arena on Sunday, 22 November, five days before the tie in Belgium begins.
The 28-year-old said: "If you reach the final and play on the Sunday you also need to take time off - you can't just play five matches against the best players in the world and then not take any days off."
But Chris Kermode, executive president of the ATP which governs men's professional tennis, said Murray would be expected to play in London.
|BBC tennis correspondent Russell Fuller|
|"Murray said quite clearly in a BBC interview after the semi-final win over Australia that he would like to devote the week before the Davis Cup final to practice on clay - to allow his back more time to adjust to the surface. He has come to the conclusion that he won't be at his best for the final if he spends the preceding week contesting some potentially gruelling matches on the hard court of the World Tour Finals.|
|He would take a big financial hit, and could theoretically be banned from the ATP Tour, if he did miss the season finale, but has an excellent relationship with boss Chris Kermode. This one is likely to be played out behind closed doors."|
"The ATP World Tour Finals is a mandatory event on the ATP World Tour," he said. "All players who qualify, unless injured, are required to compete in the event."
Belgium are hosts for the final because of a rotation policy that sees teams alternate home advantage in fixtures against each other in the Davis Cup.
The last time Britain faced Belgium, in 2012, the match was held in Glasgow where Belgium took a 4-1 victory.
Britain, who lead the head-to-head between the two nations 7-4, are aiming to win a first Davis Cup since 1936, when a team led by Fred Perry beat Australia 3-2 on grass at Wimbledon.