In July 2008, McGahan took up the position as the director of coaching of Munster following Declan Kidney's departure to take over as Ireland coach.
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In November 2010, he was selected by Ireland's head coach Declan Kidney to make his International debut for Ireland against Samoa on the 13th of November 2010 during the 2010 end of year rugby tests He then came off the bench against the All Blacks and Argentina.