Their triumph has already gone down as one of the greatest sporting upsets of all time and Ranieri is unsure his history boys can repeat the feat .
Ranieri had never previously won a league title in a 30 - year managerial career .
Their triumph has already gone down as one of the greatest sporting upsets of all time and Ranieri , who had never previously won a league title in a 30 - year managerial career , is unsure his history boys can repeat the feat .