Helena Costa has claimed that it was Clermont Foot's "total amateurism" which led her to resigning before she had even taken charge of a game at the Ligue 2 side.

The 36-year-old became the first female manager in the history of professional French football in May, but walked out on Monday before taking to the dugout.

Costa has now revealed the reasons behind her sudden departure, alleging that players were signed without her knowledge and that Clermont's sporting director did not reply to any of her emails during a five-day period.

In a statement, she said it was "a sequence of events which no coach would allow as they revealed a total lack of respect as well as total amateurism.

"For any leader in an organisation who is responsible for a team, it's unacceptable."

The Portuguese had previously coached the Iran women's national team and scouted for Celtic.