Bern, Switzerland - Switzerland included Roger Federer in their team for a Davis Cup world group relegation playoff against the Netherlands next week.
The Swiss tennis federation says Federer, who hopes to be in the US Open final in New York on Sunday, is undecided about playing five days later in Amsterdam.
The line-ups can be changed as late as one hour before the match draw next Thursday, September 13.
Federer was picked alongside 19th-ranked Stanislas Wawrinka - who was playing Novak Djokovic in a fourth-round match on Tuesday - Marco Chiudinelli (No 134) and Henri Laaksonen (No 410). The 20-year-old Laaksonen has switched nationality from Finland.
Switzerland will play the Dutch on outdoor clay courts.
The winner stays in the top-tier, 16-nation world group.