Toulouse and France centre Gael Fickou has been ruled out for a month with an ankle injury.
The 18-year-old sustained the injury after coming on as a replacement in Toulouse's 35-14 win over Treviso in the Heineken Cup on Sunday.
It means he will miss the pre-Six Nations training camp with the French squad and also Les Bleus' first two matches against Italy on 3 February and Wales six days later.
He will also be sidelined for Sunday's crucial Heineken Cup clash at Leicester, with the winner progressing to the knockout round.
Fickou announced the news of his injury on Twitter, saying: "Verdict: 4 weeks out, twisted ankle (external ligament), that's part of the game!"
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.
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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.