Chelsea are close to signing French midfielder Lesley Ugochukwu from Rennes for 27m euros (£23.2m).
Ugochukwu, 19, has made 47 Ligue 1 appearances for Rennes and has also featured in the Europa League.
He is yet to make his senior debut for France but has played for his nation at under-17, under-18 and under-19 levels.
Chelsea manager Mauricio Pochettino said recently that the Blues need to add to their midfield.
Ugocukwu, though, could well be sent immediately back out on to Ligue 1 side Strasbourg if a deal is finalised, after the Blues' ownership group purchased a majority stake in the Alsace side in June.