Chelsea agreed to sign defender Wallace Oliveira dos Santos from Brazilian club Fluminense during the January transfer period.
As part of the agreement, the 18-year-old will remain with Fluminense until the end of the season, Chelsea said on its website.
The 18-year-old made his senior debut in Brazil this season and made 18 appearances in helping Fluminense to the league championship and the Rio State League and the Guanabara Cup titles.
An under-20 international, he was part of the Brazil team that last year won the South American under-17 championship and finished fourth at the World Cup in Mexico.
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