The former Shamrock Rovers midfielder has agreed terms with St Pat's for the 2017 SSE Airtricity League season.
Pat began his professional career at Arsenal before moving to Scotland and had spells with Falkirk, Hibernians, Greenock Morton, St Mirren and St Johnstone.
He returned to Ireland in 2014 and went on to play 65 games for Shamrock Rovers over three seasons.
He joins Gavin Peers at Richmond Park as Liam Buckley builds his squad for the 2017 season which will start on Friday, February 24th.
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