The Brazilian promise was Gremio's Copa Libertadores hero last week and pledged his immediate future to the club with a new deal
Barcelona and Liverpool target Luan has signed a fresh deal with Gremio that extends his contract up until 2020.
The 24-year-old forward received offers from several European clubs last summer to leave Porto Alegre, but decided to stay in his native Brazil.
And, just hours before Luan and Gremio take the field in Wednesday's Copa Libertadores semi-final, second leg against Barcelona of Ecuador, the club announced he had put pen to paper on a new contract.