Lille president Michel Seydoux has revealed he has appointed legal consultants to help him sell his stake in the Ligue 1 club.
The 65-year-old became the majority shareholder in 2004 and has overseen the club prosper during his time at the helm.
Lille won their first league title in over 50 years in 2010/11 and made the switch to a new stadium in August this year.
"I commissioned a firm last week to help me look for a partner or a buyer," Seydoux told L'Equipe.
"I always said I was looking for someone. It is the only solution to stay competitive and to make the club grow."
The French side have struggled this season both domestically and in European competition.
They are eighth in Ligue 1 and bottom of their Champions League group.