The Gremio midfielder has been tracked by a host of Europe's elite, including Manchester United, who were strongly linked with a move for the 18-year-old last summer.
Real Madrid, Barcelona and Juventus are also chasing the youngster, nicknamed The Black Pearl.
Douglas is yet to become a regular in the Gremio first-team, but that has not stopped him being chased by most of the world's elite.
No deal"We know that many people from various European clubs have come to Brazil to see Douglas," his agent Cesar Bottega told Calciomercato.
"Some have seen him play for the Under 20 national side and since then we have been unable to declare our public appreciation.
"He showed many qualities and it is normal people will like him.
"But we have not talked to any teams, we know clubs are following him but there is nothing official.
"Nobody has done anything, the big clubs are very careful. They know who to watch - but there is nothing."