The former world No.1 faces the prospect of potentially not playing another competitive match in the city where he was born following his latest decision.
The duo will be absent from the team event as they deal with their own issues away from the court.
Roger Federer has explained that he hopes that the ITF will make some amendments to the Davis Cup changes.
Madrid will host the first Davis Cup Finals in 2019, with Lille and Indian Wells to host the next two years.
Players including Lucas Pouille and John Millman have aimed their anger over the Davis Cup reforms that were approved today.
The Davis Cup will receive a transformation next year after the reforms received a 71% majority at the AGM meeting in Orlando.
After a series of discussions, the LTA has outlined three reasons why they will not back the overhaul of the 118-year-old competition.
Later this week the general assembly of the ITF will decide the fate of the most famous men's tennis team competition in the world.
The future of the 118-year-old event will be decided later this week amid a division amongst European tennis federations in the sport.
Rod Laver has lead Australia's charge to oppose the Davis Cup reforms.
Manolo Santana has wrote an open letter explaining that he opposes the Davis Cup reforms that are being suggested at next week's AGM meeting.
Will the addition of the American businessman have any impact on the future of the Davis Cup?
The proposed Davis Cup reforms have received strong criticism from Tennis Australia and Tennis Europe ahead of this month's vote.
A vote on the future of the tournament will take place in three weeks time.
Lleyton Hewitt has expressed his latest anger over the International Tennis Federation.
The ITF hopes to attract support for their proposed changes to the team event with a new compromise
The world No.1 has admitted that the Kosmos-back proposal is far from perfect
The French player has spoken out about the ongoing debate concerning plans to change the format of the Davis Cup
A total of five champions from the past eight years will participate in this year's playoffs
Two of the last three Davis Cup champions Argentina and Great Britain are the top two seeds for Tuesday’s World Group Play-Off draw. The World Group...