The Alsasua case has come to its last stop during the courtroom, the European Court of Human Rights in Strasbourg. At the beginning of the year, lawyers have filed two appeals for each of the defendants. The defenses claim in their writings that the right to a fair judge has been violated in Spain and that the evidence submitted has not been accepted.

To justify the first argument, the European Court will recall that the holder of the First Criminal Chamber of the National Court is Concepción Espejel, married to a colonel of the Civil Guard and awarded the Merit Prize of that institution. The lawyers argued that this is a "manifest, affective and psychological link" and filed an appeal against the judgment in 2018, which was rejected by Espejel himself. The judges of the Criminal Chamber of the Spanish National Court José Ramón Navarro and Eloy Velasco also received this award, so the defenses have also appealed the judgment.

The second argument is that the eight Alsasua defendants have been violated the right to a fair trial. Lawyers, among others, have reported that during the investigation of the case they were prevented from presenting evidence and witnesses. For example, that Adur Ramirez de Alda appeared with other clothes on the stands of the Burunda fronton; or the video recorded by Iñaki in which one of the civilian guards, after the incident, looks for the alleged aggressors and does not identify anyone.