Hazard has been linked with the likes of Arsenal, Real Madrid, Barcelona, Paris St Germain and Manchester United in recent months.
Lille chairman Michel Seydoux said: “The price is €50m (£43m) and this is clear in advance.
“We are at a time when the club is having a real discussion about what to do but it will depend on many factors.
“First, our economic potential and then it depends on the proposals we receive.
“Nobody is unsellable and you would be able to look for solutions in the market with the money we’d receive.”
