Hannigan was 7-0-3 as a starter earning five shutouts and remains the club's single-season record holder for goals against average (0.56) and saves (75).

He also set the club record for saves in a game when he made 18 stops in a 3–1 win against the Reading Rage on July 17, 2004.

[2] He returned to the United States in 2006 to play for the Rochester Raging Rhinos in 2006, but never saw any first-team action, and moved on to Miami FC in 2007.

After a year out of the game in 2010, Hannigan signed to play with the Ocean City Nor'easters in the USL Premier Development League in 2011.

[5] Hannigan signed in January 2012 with expansion side San Antonio Scorpions of the North American Soccer League.