Palmeiras winger Luis Guilherme is in London to sign with West Ham United.
The 18 year-old touched down on Monday and is due to undergo a medical ahead of penning terms.
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Palmeiras have accepted a £20m offer from the Irons for the youngster. He will take his medical tests today.
Hammers technical director Tim Steidten is behind the swoop, having spent time in Brazil to close the deal.
Guilherme made his Palmeiras debut last year aged 17 and played in the Copa Libertadores this season.