Switzerland's Stan Wawrinka said in Geneva on Thursday that he and Roger Federer will decide next week whether to compete in the upcoming Davis Cup first round tie in Belgium.
"We're currently discussing it with Roger (Federer) and Severin (Lüthi, captain)," Wawrinka said.
Swiss Tennis Federation president Rene Stammbach has put the chances of the pair competing in the first round tie as "below 25 percent".
Wawrinka and Federer helped Switzerland lift their first ever Davis Cup title against France in Lille last November.
The Swiss open their title defence against Belgium in Liege from March 6th-8th.
"My objective for this season is to qualify for the London Masters," said Wawrinka, who was beaten in the semi-finals of the Australian Open to eventual winner Novak Djokovic..
"I know that I'm capable but I know how difficult it is."
Wawrinka, the 2014 Australian Open champion, has fallen from fourth to ninth in the ATP rankings.
"Reaching the semi-finals remains something exceptional for me," he said.
"After my victory at Chennai (India) it was an ideal month of January, I'm very positive concerning my current game."
He was speaking at the launch of the new Geneva Open ATP tournament which will replace the Düsseldorf ATP event to be played on May 17th-23rd just before the French Open at Roland Garros.