In an interview with the BBC, Mark McGhee named Sadlier as potentially the best young centre forward he had ever worked with in his managerial career.
[5] He was highly favoured to make Mick McCarthy's final 23-man Republic of Ireland squad for the 2002 FIFA World Cup, but had to withdraw with a hip injury which ultimately ended his football career prematurely.
In 2006, Sadlier was approached to write a column for the Sunday Independent after previously doing some punditry work with Setanta Sports, he also contributes regularly to Newstalk.
[11] In 2012, Sadlier was a studio analyst as part of RTÉ Sport's coverage of UEFA Euro 2012, and also appeared on Craig Doyle Live on 11 June 2012.
[17] Sadlier holds a BSc in Sports Science from the University of Surrey and a Higher Diploma and MA in Psychotherapy from Dublin Business School.