Mauricio Pochettino believes his old Southampton side changed English football.
The Argentine was the surprise choice to take over from Nigel Adkins in January 2013 in the Saints' first season back in the Premier League after a seven-year absence.
In his one full season in charge he led the south coast club to an eighth place finish before Tottenham came calling in the summer of 2014.
But Pochettino believes his methods brought over from Spain and a trust in youth have had a profound impact on the way football is now played in England.