Barcelona have agreed an option to buy Gremio midfielder Arthur in the summer.
The Catalan giants have reached an agreement to secure first option on the 21-year-old, who will cost £26.6m plus £8m in add-ons should Barca choose to activate the deal in July.
Arthur is set to become the third Brazilian in Ernesto Valverde's first-team squad, with Philippe Coutinho and Paulinho already at Camp Nou.
Barcelona confirmed the deal in a statement on Sunday, which read: "FC Barcelona and the Brazilian club Gremio de Porto Alegre have reached an agreement on a purchase option for the player Arthur Henrique Ramos de Oliveira Melo, whereas FC Barcelona may exercise this right on the player's federative rights during July of 2018.
"In the event that the Club finally exercises the option signed, the price of the transfer is set at €30m plus €9m in variable amounts."