Gremio president Romildo Bolzan Júnior insists Arthur Melo will remain to the end of this Brazilian season.
Barcelona are expected to take up their option for Arthur in July.
But Romildo insists: "There's no chance that Arthur leaves the club in the coming months because it's already written down, there's a contract signed and that is not a possibility.
"Barcelona have never brought to the table any interest in signing Arthur halfway through the [Brazilian] season.
"The only right that Barça have is an option to buy him, in which case they must do the transaction before July 15."