It all started in 1986 .
As the story goes , Marcelo Bielsa knocked on the door of Mauricio Pochettino at 2am , to persuade him to sign for Newell 's Old Boys .
It all started in 1986 , and as the story goes , Marcelo Bielsa knocked on the door of Mauricio Pochettino at 2am , to persuade him to sign for Newell 's Old Boys .