Munnelly emerged on to the scene in 2000 as part of the Laois minor team and in 2002 and 2003 he was part of the Laois Under 21 team. In 2003, he joined the Laois senior football team, helping them to a Leinster Senior Football Championship.
In 2005, he captained Laois to the final of that year's Leinster Senior Football Championship; they were beaten by Dublin. The team went on to defeat Derry in the All-Ireland Senior Football Championship quarter-final, before being beaten by Armagh in the All-Ireland Senior Football Championship semi-final.
In 2006, Laois were defeated by Mayo in their All-Ireland Senior Football Championship quarter-final encounter. It was all downhill from there. Following this, Laois were knocked out in the All-Ireland qualifiers by Derry in 2007 and by Down in both 2008 and 2009.
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