Sorry, a bit late replying to this. Koeman hasn't won it as a manager. Del Bosque not correct either as he didn't win it as a player.
The ones that managed to win as both player and manager are:
Miguel Munoz
Giovanni Trapattoni
Johan Cruyff
Carlo Ancelotti
Frank Rijkaard
Pep Guardiola
Zinedine...
Both correct. Ancelotti as a player with Milan in 1989 and 1990 and as a manager in 2003 and 2007. Guardiola was in Cruyff's 1992 team as a player and subsequently won it as manager in 2009 and 2011.
Yup.
Trappatoni won it twice as a player with Milan in the 1960s and won it as a manager with Juventus in 1985. Cruyff won it 3 years on the spin as a player with Ajax and then won Barcelona's first ever European Cup when he was manager when they beat Sampdoria at Wembley in 1992.
Of the...
Zinedine Zidane on course at the moment to become the 7th man to win the European Cup as both a player and manager. Some very illustrious names amongst the other 6.