Marseille have insisted that defender Gael Givet will only leave the club for the right price.
President Pape Diouf confirmed last week that Marseille would be willing to let the 26-year-old France international go.
Diouf revealed that there had been interest in Givet from Panathinaikos and a number of English clubs.
West Ham have been linked with Givet for some time and reports on the continent have now suggested they are in advanced negotiations over a deal.
Givet is thought to favour a move to the Premier League but Marseille's directors have made it clear they will not part with him cheaply.
"We only are interested in a good deal," they said in a statement. "If this is not
possible he will stay at Marseille."
Givet, who joined Marseille from Monaco in 2007, is valued at around 7million euros (£5.6million).