Aston Villa owners V Sports have reduced their stake in Portugal's Vitoria.
The decision has been made after both clubs qualified for Europe next season.
UEFA's Article 5 regulations prohibit an individual controlling decisions and having influence at more than one club competing in Europe.
It was announced on Villa's website today: "V Sports has today announced that it has reduced its stake in Vitoria Sport Clube Futebol, SAD to 29% by transferring shares equalling 17% of the club's total equity back to Vitoria SC.
"It also no longer has any representation on the board of directors of Vitoria Sport Clube Futebol, SAD in order to comply with all UEFA regulations and ensure the independence of both Vitoria Sport Clube Futebol, SAD and Aston Villa FC."