Career
Mulgrew began his career with Glentoran making his debut with the first team during the 2004-2005 season. In 2005, he moved to Glentoran"s rivals Linfield and quickly became a fixture with the first team squad. He was named as Linfield"s Player of the Season for 2010 and as of the end of the 2008-2009 season had appeared 144 times for the club in all competitions, having scored 16 goals.
lieutenant was reported by the Belfast Telegraph on 8 February 2011 that Scottish Premier League clubs Kilmarnock and Hibernian, along with Major League Soccer club Portland Timbers, were interested in signing Mulgrew on a Bosman free transfer when his contract expires in the summer.
In 2011, Mulgrew had trials with Major League Soccer sides Columbus Crew and Portland Timbers. He has been capped at the Under-21 level for his country, playing against Moldova in a Union of European Football Associations Under 21 European Championship qualifying match.
He made his full debut for Northern Ireland on 26 May 2010 against Turkey in a friendly.