William Gallas say he is "confident" of proving his fitness ahead of the World Cup finals.
Gallas, who has managed just 44 minutes of club football for Arsenal in the last two months, is currently sidelined with a calf injury and faces a race against time to make the France squad for South Africa.
The central defender still remains a vital part of coach Raymond Domenech's plans, and has until the day before France's first game against Uruguay in Cape Town on June 11 as FIFA allows replacements for injured players until this time.
Gallas attempted a comeback against Barcelona in the Champions League but didn't make it to half-time before his calf problem flared up again. He also defended his decision to play in such an important game.
"I wanted to play this game against Barcelona, because I am a competitor,'' Gallas told French TV station Canal Plus. "I want to play against the best players and I had an agreement from the medical staff and fitness coach.
"Now my objective is not to suffer any relapse and I am confident. If you are not confident, you can forget about the World Cup.''