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 world number three Andy Murray, Britain reached their first Davis Cup final since 1978 by beating Australia in the semi-finals on Sunday.
But the decision to play the final on clay on 27-29 November could mean Murray misses the World Tour Finals.
The Scot, 28, said he would need time to prepare for a switch in surface.
The World Tour Finals - on a hard court - finish at London's O2 Arena on Sunday, 22 November.