Rennes placed a $67 million valuation on midfielder Eduardo Camavinga.
Real Madrid and Borussia Dortmund are reportedly interested in the 17-year-old.
Dortmund will reportedly bid $56 million for Camavinga this summer, but are uninterested in getting into a bidding war.
Camavinga is the most valuable under-18 player in the world, according to Transfermarkt.