France fly-half Romain Ntamack looks set to miss the start of the Six Nations after suffering a double fracture of the jaw, with Ireland set to face Les Bleus in the second round of action in mid-February.

The 21-year-old, a key player for France and a scorer of a try in the win over Ireland in October, sustained the injury during Toulouse's match with Bordeaux in the French Top 14 on Sunday.

He has to undergo surgery and said he would be out for "a few weeks".

He wrote on Twitter: "Following a blow to the jaw which occurred in the first half of the match between Toulouse and Bordeaux the examinations show a double fracture of the jaw. I will have to undergo an operation and be away from the field for a few weeks."

Ntamack was nominated for Player of the Championship for the 2020 tournament but missed out to French half-back partner Antoine Dupont, who also notched a try against Ireland in the October fixture.

Ireland host France on 14 February, eight days after the French begin their Six Nations campaign in Italy.