Osasuna filed an appeal with the Spanish football federation (RFEF) on Friday stating Barcelona should not have fielded defender Iñigo Martínez in their LaLiga game over a technicality as he sat out Spain's matches with an injury.
Martínez, who withdrew from the Spain squad for their Nations League games due to a swollen right knee, played the full 90 minutes in Barcelona's 3-0 win on Thursday which moved the league leaders three points clear in LaLiga.
"The club understands that the participation of Iñigo Martínez in yesterday's match violated article 5 of Annex I of the FIFA Regulations on the Status and Transfer of Players," Osasuna said in a statement.