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These guys played very small samples of professional football:
Jose Mourinho—played for Rio Ave, Belenenses and others
Sven-Goran Eriksson—played with Karlskoga and others
Avram Grant—started coaching at 18 in Israel
Andre Villas-Boas—on his way to the top after success at Porto and Tottenham.
Ralf Rangnick—never made it past the Stuttgart amateur team
In Portugal it's quickly becoming the norm for managers to not play first but rise quickly through the ranks after coaching junior teams with success.
Vitor Pereira (FC Porto), Leonardo Jardim (Braga) and Pedro Caixinha (Nacional) don't have any playing experience but remain some of the finest young coaches in the SuperLiga.