Rennes president Nicolas Holveck says they're determined not to lose Edourdo Camavinga this summer.
The 17 year-old midfielder is a target for Real Madrid.
"The priority will be to keep our team, which has shown all its talent in this fantastic season," Holveck told L'Equipe.
"We'll have to be smart in the transfer market to improve the team and make it the best we possibly can in order to pass this qualifying round."
Rennes are owned by the Pinault family who are billionaires meaning they are under no pressure to sell their best players.