Issa Diop will undergo a medical at West Ham ahead of a £21.9m move from French club Toulouse, according to Sky sources.
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The France U21 centre-back has been a prime target for the Hammers this summer and is close to completing his move to the London Stadium.
Diop is due in London on Monday for a medical exam and to finalise personal terms after a deal was agreed with the French Ligue 1 club last week.
Monaco, Marseille, RB Leipzig and Sevilla have all been interested in signing the promising young defender.
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He made 31 appearances as Toulouse narrowly avoided relegation last season, taking his tally to just under 100 for the club.
Toulouse-born Diop has represented France at every youth level from U16 to U21, for whom he has five caps.