Besiktas announced the appointment on Sunday. The former Portugal coach is the fourth manager of the Istanbul giants after Senol Gunes, Burak Yilmaz and Riza Calimbay.
João Carlos Viana Cunha Costa, Paulo José Ramos Mendes, Justino Fernando, Ricardo Miguel Candido de Sousa Santos and Jorge Manuel Caetano do Rosário will accompany the 69-year-old coach on what will be his first adventure in Turkish football.
Santos, it should be remembered, was a free agent after leaving the Polish national team.
In Istanbul, Santos' mission is to rebuild one of the country's most representative clubs.
In a season in which they have already been eliminated from European competition (they fell in the group stage of the Conference League, behind Club Brugge and Bodo/Glimt), the team is in fifth place in the league, 18 points off the top.
Their opening game will be next Tuesday against Rizespor.
