Tony Marsh admits France have taken a risk by picking him for the Rugby World Cup.
Marsh says he is mentally ready
The 31-year-old centre made Bernard Laporte's squad despite undergoing chemotherapy for testicular cancer and then suffering a torn calf muscle.
"I've only had four rugby sessions in the last 11 months," Marsh told l'Equipe newspaper.
"I've got a lot of work to do to get to the same fitness levels as the rest of the squad.
"The staff took a risk picking me and it's put extra pressure on me to get back to my old form... I'll do everything to be ready.
"I'm 100% ready mentally. I don't think about my illness any longer. It's in the past."
Backs: Fabien Galthie (captain), Dimitri Yachvili, Frederic
Michalak, Gerald Merceron, Damien Traille, Tony Marsh, Yannick
Jauzion, Brian Liebenberg, Christophe Dominici, Pepito Elhorga,
Xavier Garbajosa, Aurelien Rougerie, Nicolas Brusque, Clement
Forwards: Jean-Jacques Crenca, Jean-Baptiste Poux, Sylvain
Marconnet, Olivier Milloud, Yannick Bru, Raphael Ibanez, Olivier
Brouzet, Fabien Pelous, David Auradou, Jereme Thion, Serbe
Betsen, Olivier Magne, Imanol Harinordoquy, Patrick Tabacco,
Christian Labit, Sebastien Chabal.