A deal was agreed in principle on Wednesday afternoon for the highly-rated 21-year-old centre back.

Diop, who captains the France U23 side, made 37 appearances for Toulouse last season.

The club finished 18th in Ligue 1 last term but secured their top-flight status with a play-off win over Ajaccio.

Sky Sports News understands West Ham are also in advanced talks to sign Swansea goalkeeper Lukasz Fabianski.

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