Lille have made their first signing of the summer with the capture of Ronny Rodelin.
Last season's double winners announced on Monday that Nantes striker Rodelin had arrived on a four-year deal.
The rangy 21-year-old joined Nantes from Rodez in 2008 before being loaned to Troyes in 2009-10.
Rodelin, who hails from Reunion, then scored five goals in 15 matches for Nantes in the second division last season.
"Coming to LOSC is a great satisfaction for me," he said.
"I know that I still have lots of work to do but here at the Domaine de Luchin (Lille's training base), I'll be in the right company to progress."
Lille ended a 56-year wait for major honours by winning the Ligue 1 title and French Cup last season.
However, coach Rudi Garcia has since lost centre-back Adil Rami to Valencia and midfielder Yohan Cabaye to Newcastle.