He made his first grade debut in round 16 of the 2001 NRL season against Cronulla at Bruce Stadium.

[8] The 27-year-old joined Manly teammate Chris Hicks in moving to Warrington Wolves for 2008's Super League XIII.

[9] In March 2009 rumours emerged linking him with his former club Canberra and playing alongside brother Joel Monaghan again.

[7] Monaghan played for Warrington in the 2009 and 2010 Challenge Cup Final victories over Huddersfield and Leeds respectively, winning the Lance Todd Trophy for his Man-of-Match performance in 2009.

[16][13] Monaghan played in the 2013 Super League Grand Final defeat against Wigan at Old Trafford.