Jonathan Sexton's head coach at Racing Metro has linked the out-half's tackling style to the concussions he has received in the last year.
Laurent Labit made the comments in French sports daily L'Equipe after Ireland's win over France in the Six Nations.
"Defensively he has a problem that all the Irish have. They come at you in the tackle with their heads very high. His concussions come from that. Unfortunately, I fear he will suffer more of them," said Labit.
Sexton returned to action against France, following a 12-week spell on the sidelines as part of recovery from concussion.
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