Switzerland's Roger Federer, who has been hampered by back problems, has been named to play in the second singles rubber of the Davis Cup final against France's Gael Monfils on Friday, organisers announced on Thursday.
But the world number two trained on Thursday at Lille's Pierre Mauroy stadium, where the tie will be played on clay.
Switzerland's world number four Stan Wawrinka will open proceedings against Jo-Wilfried Tsonga on Friday.
Switzerland captain Severin Luthi named Marco Chiudinelli and Michael Lammer to play in Saturday's doubles against Julien Benneteau and Richard Gasquet but he has until one hour before the start of the match to change his lineup.
Federer will face Tsonga in the reverse singles with Wawrinka playing Monfils in the potentially deciding fifth match.
Image: Roger Federer of Switzerland reacts as he returns the ball during a Davis Cup training session at the Pierre Mauroy stadium ahead of the final against France.
Photo: Pascal Rossignol
Davis Cup: Federer injury and spat hit Switzerland's chances
'Having more success at the Slams next year is my main goal'
Paris Masters: Murray books ATP Finals spot; Wawrinka knocked out
Will Federer win his seventh ATP World Tour Finals title?
Excited to be in Roger Federer's team: Sania