— Olympique de Marseille (@OM_Officiel) July 1, 2020
However, he has instead joined Marseille who announced his signing without mentioning Watford.
Watford are likely to seek an amicable agreement with OM and receive some compensation.
Prior to the transfer saga, Gueye played for Ligue 2 side Le Havre.
Of Senegalese origin, Gueye has represented France at under-18 and under-19 level.
A physical and technical midfielder, he strengthens Andre Villas-Boas’ squad after Marseille achieved Champions League qualification.