Sherlock was born and raised in Finglas on the northside of Dublin, the son of an Irish mother and a father from Hong Kong.
Sherlock also played professional football for UCD and signed for Shamrock Rovers in August 1998[2] becoming the club's top goalscorer in his first season.
He was part of the 2005 Leinster Senior Football Championship-winning side that defeated Laois, scoring a total of two points in the final.
Following Dublin's shattering defeat at the hands of Kerry in the All-Ireland quarter-final on 3 August 2009, Sherlock was thinking about hanging his boots up but Pat Gilroy persuaded him to stay.
[7] In November 2022, Sherlock was announced as performance coach of the Westmeath senior footballers, working under the management of Dessie Dolan.