Marseille admit they face losing Bosman prospect Taye Taiwo.
Tottenham and Everton are reportedly battling Benfica for the Nigeria left-back.
"We are in discussions," said Marseille sporting director Jose Anigo. "They have dragged on for several months. We fight, we fight hard to try to keep him. It's not easy.
"There are many big clubs who position themselves, precisely because he is free. It's hard for us."