Barcelona intend to 'defend their interests' after Samuel Eto'o demanded three million euros (£2.7m) following his move to Inter Milan.
His demand is based on a Spanish rule that a player should get 15 per cent of the amount of his transfer to another Spanish club.
Barcelona stated that they valued Eto'o at 20million euros when they included him in a swap deal that brought Zlatan Ibrahimovic to Camp Nou.
Eto'o therefore wants three million euros, even though Barca claim the rule only applies when it is a transfer between two Spanish clubs.
However, a precedent has been set after Albert Luque successful asked for 2.1 million euros from Deportivo La Coruna following his switch to Newcastle.
Eto'o's case could end up in court if the two parties fail to reach a settlement but talks between the striker's representatives and Barca are said to be ongoing.
It is understood that both sides are seeking an amicable agreement and Barca are determined to see justice done.
"We are going to defend our interests," said a club spokesman, who added that each transfer was different.