How many world class players have also made it as great* managers?
I put the asterisk in there because there is always a debate about King Kenny, whether he was a great manager or simply inherited a great side and then built another one at Blackburn with endless funds.
I can think of:
Johan Cruyff (European Cup win with Barcelona)
Kenny Dalglish
Franz Beckenbauer
Zidane
Mario Zagallo
Diego Simeone
Pep Guardiola/Antonio Conte/Carlo Ancelotti/Didier Deschamps (were they truly great players in the class of the above? Debatable, although all won a lot of caps)