Rennes are moving for Tottenham winger Georges-Kevin N'Koudou.
Sky Sports says the winger is available before Friday's transfer deadline in several European countries, and he is considering his potential options.
Mainz had agreed terms with Spurs over a loan with an option to buy earlier this month.
N'Koudou has struggled for first-team games since joining Spurs for £11m from Marseille in 2016, spending the second half of last season on loan at Burnley.
He made just eight Premier League appearances for the Clarets, however, and has been among several players on the transfer market at Tottenham this summer.