Cousins was involved in full-time football from the age of sixteen when he joined English club Chelsea, where he spent two years.
Throughout his career he played for Dundalk, Liverpool, Hereford United, Middlesbrough, Bohemians, Shamrock Rovers and Bray Wanderers.
Due to injury he failed to make a single first team appearance before getting a free transfer to Middlesbrough at the end of the 1992/93 season.
In his first season with Shamrock Rovers he was the joint top goalscorer in the League of Ireland Premier Division,[1] winning Player of the Month in February 1997.
In his 5th season in charge, Cousins eventually led the Town to their first ever league title in senior football as they were crowned 2014 First Division champions.
The following season proved more difficult however as Longford sat rooted to the bottom of the division before Cousins' decision to step down on 13 August 2016.