Lille are preparing to lose defender Gabriel at the end of this season.
The Brazilian has Leicester City, Arsenal and Everton all in contact with Lille ahead of the summer market - along with PSG.
LOSC are now resigned to losing Gabriel this summer and have set their asking price.
The northern club want €25-30m to sell the stopper - and are confident of that valuation being met given the growing interest they're fielding.
Everton are regarded as favourites to land Gabriel this summer.