Talking before their first game in 2015 , he said he had underestimated the after - effects of the World Cup , and the independence of his players .
Hiddink has admitted to making mistakes .
Talking before their first game in 2015 , Hiddink said Hiddink had underestimated the after - effects of the World Cup , and the independence of Hiddink 's players .
Hiddink has admitted to making mistakes .