“The ruling also stresses that ‘the purpose of allowing additional spending is so that a long-term injury does not weaken the team’s competitiveness, not to use a long-term injury to allow the registration of players whose salaries exceed the limit, which is what FC Barcelona is attempting’.”

Barcelona registered Olmo after their squad was hit by long-term injuries, allowing the club to allocate a portion of their wages to register the player.

His four-month allowance will expire at the end of December and the Commercial Court number 10 of Barcelona rejected the club’s request to provisionally register him.

Spanish media reported Barcelona have filed an appeal to the magistrate court which will be heard on Monday, a day before the deadline.

La Liga said the decision not to register Olmo, who was a youth player at Barcelona but left for Dinamo Zagreb aged 16, was initially taken by its Budget Validation Body.

It was then confirmed three times by its Financial Fair Play Committee, its Social Appeals Committee and by the Uefa Second Instance Licensing Committee of the Spanish Football Federation.

Olmo, who helped Spain win the European Championship in the summer, has scored six goals in 15 appearances for Barcelona this season.

Barcelona are third in La Liga, three points behind leaders Atletico Madrid.