He with Sexton during his time with Racing 92.
Jonathan Sexton has hit back at a French doctor who claimed the Ireland captain had suffered 30 career concussions.
Dr. Jean-Louis Chermann worked with Sexton during his time with Racing 92.
Sexton is undergoing the return-to-play protocols ahead of Sunday’s Six Nations meeting with France after a knock to the head in Cardiff.
But the out-half has reacted with dismay at Dr. Chermann’s claims.