Spanish FA president Angel Maria Villar and his son have reportedly been arrested on allegations of corruption.
The president of the Spanish Football Federation, Angel Maria Villar, was detained by police Tuesday as part of a corruption probe, a judicial source said.
Police said the other three men who were arrested were Juan Padron, federation vice president of economic affairs, and the president and the secretary of the regional federation for Tenerife.
Mr Villar, a retirned Athletic Bilbao player, has been head honcho of the Spanish FA for eight terms.
Anti-corruption prosecutors and migistrates are leading the investigation, Spain's High Court told Reuters.
While other top Federation Internationale de Football Association bigwigs have seen their careers come crashing down, Villar was fined CHF 25,000 by FIFA's ethics committee in 2015 for failing to cooperate with the investigation into the awarding of the 2018 and 2022 World Cups to Russia and Qatar respectively.
A strong ally of Sepp Blatter and Michel Platini for many years, the Basque has also been a vice-president of FIFA since 2002, and was last year made acting chairman of the Organising Committee for the World Cup 2018 after corruption charges had cleared away numerous previous office holders in world football's governing body.
Gorka Villar worked in recent years for South American body Conmebol, as legal director then director general for three presidents who were implicated in the American federal investigation.
Despite all this, Villar took on the interim UEFA presidency for roughly a year following Platini's suspension until the election of Ceferin.