West Ham have agreed to sign Brazilian defender Luizao from São Paulo.
The 20-year old left-sided centre back arrived in England on Monday ahead of a scheduled medical and will sign a three-and half-year contract from January after his deal with the Brazilian side expires.
Luizao has been signed for the club's development squad. West Ham have also spoken to São Paulo about a potential deal for their 20-year old midfielder Pablo Maia.
Meanwhile, Bayer Leverkusen are maintaining an interest in West Ham's 30-year-old full back Vladimir Coufal as they consider a move next month.
The Hammers are looking to strengthen their squad in January following a disappointing start to the season which has seen them take just 14 points from a possible 45.
David Moyes' side are languishing in 16th place in the Premier League as a result, despite spending £156million over the summer.
Lucas Paqueta, Gianluca Scamacca and Nayef Aguerd all arrived for big money, although the latter has only made four appearances after suffering a serious ankle injury during their pre-season friendly against Rangers.