Bastia have hit back at former boss Claude Makelele after he likened his spell in charge of the club to an internship.
Former France, Real Madrid and Chelsea midfielder Makelele was appointed as head coach by the Corsican club ahead of the 2014-15 season.
However, he was sacked after just 13 matches, before a short spell as technical director of Monaco was brought to an end on Monday.
Following his departure from Monaco, Makelele gave an interview to L'Equipe in which he claimed his time in charge of Bastia was like being in training.
The club have responded with a stinging criticism of the 43-year-old, accusing him of "deep lack of professionalism".
A Bastia statement read: "The statement made this morning in L'Equipe by Claude Makelele, in which he said that the five months spent at the head of our professional team between June and October 2014 were 'like an internship' are unacceptable and show a deep lack of professionalism.
"Because we trusted him as a coach, and because of the weakness of his results and the cost of his dismissal, our club believes it was quite expensive for an internship.
"That being said, after this sad experience, he went to have a quite meteoric spell as part of the Monaco staff, so Bastia would advise Claude to end being an intern, and finally, with humility and respect, get a true and durable job as main coach of a high level team."