Read more: Magic Murray earns Britain historic win
If Belgium choose to stage the final on clay, Murray suggested he will forego the ATP's end of season tournament at the O2 in order to prepare for the Davis Cup a week later on 27-29 November.
Yet the world No3 could be fined by tennis players' association the ATP for missing what is a mandatory event for players on the Tour and would forego prize money of up to £1.3m from the tournament.
ATP chief executive Chris Kermode said in a statement:
The Barclays ATP World Tour Finals is a mandatory event on the ATP World Tour.All players who qualify, unless injured, are required to compete in the event...We are aware of the comments made after the Davis Cup tie in Glasgow, however our expectations are that, if fully fit, Andy would compete in this year’s tournament. Unless we hear otherwise via an official withdrawal, he is still entered to compete at The O2.
As the home side, Belgium are able to pick their preferred surface for the final and are likely to opt for clay, the surface on which they have played four of their last six home ties.
Murray, who has only won two of his two of 35 career titles on clay, has said he would choose to miss the ATP Finals in order to prepare for the final a week later
He said: "The O2 would obviously be a question mark for me if we were playing on the clay.