“When Bobby Robson took over at PSV Eindhoven in 1990, he was shocked by the culture he found there. ‘An English professional,’ he said, ‘accepts the manager’s decision, but after every match here the substitutes come and visit me.’ Debate has been part of Dutch football from at least the days of Rinus Michels and his ‘conflict principle’ by which players were encouraged to critique one another’s performances, seemingly on the logic that every pearl begins with a little grit of irritation.” Guardian – Jonathan Wilson