French neurosurgeon alarmed by suggestions Johnny Sexton 'on track' to start for Ireland

Jean Chazal's concerns follow those voiced by a colleague in the field, Jean-François Chermann, who stood Sexton down for 12 weeks in 2014 after he had suffered repeated concussions while playing for Racing 92

Johnny Sexton was injured by a knee to the head against Wales. Photo by Gareth Everett/Sportsfile

The prospect of Johnny Sexton starting for Ireland against France on Sunday, seven days after what he described as an 'obvious' concussion, has alarmed a respected French neurosurgeon.

Ireland captain Sexton and second row James Ryan are going through return to play protocols following head blows sustained in the defeat to Wales and are 'on track' to play again this weekend, according to defence coach Simon Easterby.