Chelsea's imminent signing Denner Evangelista is a cousin of Arsenal defender Gabriel Magalhaes.
The Corinthians wing-back, 17, is set to join Chelsea next year when he turns 18.
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The deal is worth a fee rising to €15m including bonuses.
Corinthians will also retain a 15 per cent sell-on clause for Denner, who is a Brazil U21 international.