Brighton & Hove Albion
On 30 April 2010, Dunk signed a two-year professional contract with Brighton & Hove Albion following impressive performances captaining the club"s youth-team The following day, Dunk made his first professional appearance starting in the 0–0 draw at Milton Keynes Dons. On 31 January 2011, Dunk signed a one-year extension on his contract keeping him at the club until the summer of 2013.
Dunk made eight appearances in the 2010-2011 season as Brighton gained promotion to the Championship.
With fellow defenders Tommy Elphick and Adam El-Abd sidelined by injury, Dunk started the 2011-2012 season alongside captain Gordon Greer, playing in Brighton"s first ever match at Falmer Stadium versus Doncaster Rovers. = Bristol City (loan) On 4 October 2013, Dunk joined League One side Bristol City on a one-month loan deal, to gain some first-team football.
= Return to Brighton & Hove Albion On 25 July 2014, Dunk signed a new four-year contract with Brighton & Hove Albion which kept him at the club until the end of the 2017/18 season. Dunk received a call-up to the England under-21 squad in November 2011, ahead of their European Championship qualifiers against Iceland and Belgium, however he did not feature in either of the games.