The publication on Wednesday of a book about France's President Emmanuel Macron and his wife Brigitte has reignited rumours of a relationship between the French leader and Iranian actress Golshifteh Farahani.

According to Paris Match journalist Florian Tardif, author of the book "Un couple (presque) parfait", an apparent slap in the face Macron received by the First Lady on their arrival in Vietnam last May, was linked to the alleged relationship.

Speaking to the broadcaster RTL, the journalist claims that Macron and Golshifteh Farahani had "a platonic relationship".

"That's what I've been told over and over again by their entourage", he said.

According to Tardif, the Head of State allegedly sent the message "I find you very pretty" to the actress.