The scrum-half was in inspirational form as Les Bleus upset the odds to beat England in the last eight, however he has not trained since suffering a dead leg in the 19-12 victory in Auckland.
Yachvili, though, insists he will be okay to tackle Wales - but he has conceded that Morgan Parra may have to take over the kicking responsibilities.
"Yes, I am confident everything is fine," he said. "There's a risk that I won't do the kicking, though.
"I am still healing but things are coming along well. I started running again this morning.
"I took a blow to the thigh in the match against England, but have rested it since then. You need a few days' rest for it to begin healing properly."
Yachvili, meanwhile, claims France have done everything they can to prepare for the challenge posed by Wales.
"For us the organisation is done and it is the team spirit which will win the game," he added. "The team spirit is good.
"We are all very motivated. This is a World Cup semi-final and an exceptional moment for anyone."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.