After several weeks of haggling, Inter are insisting Barca produce a bid equivalent to Lautaro's €111m buyout clause.
Mundo Deportivo says Barca are now prepared to pay €70m cash and include Firpo in their proposal, insisting he is worth €41m.
Of all the players offered to Inter, Firpo is among those most favoured by the Nerazzurri.
Barca are confident of eventually reaching an agreement, with Lautaro having already agreed personal terms over a five-year contract.
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