Toulouse defender Issa Diop is expected in London today.
L'Equipe says Toulouse have expected a bid of €25m from West Ham for the defender.
Diop will undergo a medical today and sign a five-year contract once he passes.
The France U21 international has spent his entire career with TFC and was also interesting Everton.
Standing at 6ft 4in, Diop primarily plays at centre-half.