Atletico Madrid have announced the signing of teenage defender Nehuen Perez from Argentinos Juniors.
The 18-year-old centre-back has signed a six-year contract to move to the LaLiga side.
Perez, an Argentina Under-17 international, trained with Jorge Sampaoli's side in Russia during their unsuccessful World Cup campaign.
Atletico have also confirmed Bernard Mensah will join Kayserispor on loan for the 2018-19 season.
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