Barcelona have set a price to sell Ilaix Moriba this month.
The teenage midfielder is inside the final year of his contract and talks over a new deal have failed to progress.
ARA says Barca have now decided to sell for €15m - plus a further €10m in bonuses.
An unnamed Bundesliga club have made an offer of €5m for Ilaix - which was turned down - and Barca have now set their asking price.
A move to England has been mooted for Ilaix, where Chelsea, Manchester United and Manchester City are all keen.