Johnny Sexton has hit out at the "inaccurate and highly inappropriate" comments of a French doctor regarding the Ireland star's concussion record.

Dr Jean-Francois Chermann, who stood Sexton down from playing duties for 12 weeks at Racing 92 back in 2014, told RMC Sport on Tuesday that Sexton had suffered approximately 30 concussions in his career.

His remarks came after the fly-half sustained a blow to the head in Ireland's Six Nations loss to Wales, meaning he is undergoing return-to-play protocols ahead of Sunday's visit of France.

Sexton was angered by Chermann's words when addressing the subject in his pre-match news conference.

"I am pretty saddened and shocked by the inaccurate reports that were thrown out yesterday," he said. "We've been here before and it's very frustrating.

"For me, I just think it's totally inappropriate that a doctor that I have seen – many years ago now – felt it was appropriate to come out and talk to whoever it was and say those things.

"It's inaccurate and highly inappropriate and I am pretty disappointed but, for me, I am so used to it, it's almost like water off a duck's back, but for my wife and mum it's very upsetting.

"But that's the world we live in.

"I thought there was patient and doctor confidentiality, I am pretty sure that exists in the world, and I just can't get over the fact that someone thought it was appropriate to just come out of nowhere and just start saying things that weren't even accurate, that's the most hurtful thing."