With Premier League clubs showing an interest, the Brazilian club know they are unlikely to retain the 24-year-old's services for much longer
Renato Gaucho has conceded Gremio will struggle to keep hold of prize asset Luan now the transfer window has opened in Europe.
The 24-year-old was part of Brazil's gold-medal winning side at Rio 2016 and has made a significant impact at club level with Gremio ever since.
Liverpool have been linked with a move for the attacking midfielder along with fellow Premier League rivals Arsenal and Tottenham.
And it is no surprise given Luan's recent form of seven goals in eight games in all competitions, helping Gremio to second in the fledgling league table and the last eight of the Copa Libertadores.