Arsenal have signed centre-back Gabriel Magalhaes from Lille, the Premier League club announced on Tuesday.
ESPN reported last month that the 22-year-old had agreed a deal that will cost Arsenal €30 million (£27m).
"So many fans were sending me messages asking me to join Arsenal, and that played a big part in me signing for this club," Gabriel told Arsenal Digital.
"I know the history and traditions of this club and it is a pleasure being here. I am very happy and hope I can contribute to many titles with the Arsenal shirt.