The former Magpie joins the Super Blues for the 2013 season after impressing during a trial period with the club on their pre-season tour of Scotland
The 20-year-old had been on trial with the club during their pre-season tour of Scotland and his performances impressed Shannonsiders' boss Stuart Taylor.
"We had a good look at Patrick back in Scotland and he took the chance to impress," Taylor told the club's official website.
"He’s a very level headed young lad and he settled in among the rest of the squad with ease. He's quick, versatile and very comfortable on the ball and will be an asset in terms of how I want us to go about our play," he added.
Nzuzi is expected to go straight into the Limerick squad for their opening league fixture against Cork City at Thomond Park on Sunday, March 10.