Lille chairman Michel Seydoux has expressed his fury at rumours surrounding the future of Jean Makoun.
Reports have claimed that French champions Lyon are interested in signing the Cameroon midfielder at the end of the season.
Makoun, who has also been linked with Premiership duo Arsenal and Manchester United, is under contract at Lille for a further four years.
And that has prompted Seydoux to vent his anger at the forces he feels are trying to unsettle his midfield lynchpin.
"I am unhappy to have heard about the rumour in the press," Seydoux told the French media.
"I am completely mad about such a method.
"Anyway, we have had no official contact from Lyon about that.
"Jean II Makoun is under contract at Lille until 2011, and we are used to respecting our contracts."