Conor Sinnott joins on loan
Sinnott moved to the Madejski Stadium after a successful trial period at the end of last year but has yet to make his first-team bow.
Royals boss Steve Coppell has decided to allow the Irish youth international to return to his homeland to get some football under his belt.
A number of clubs were keen to sign the former Bray Wanderers starlet but league-leaders Limerick won the race for his signature.
The 20-year-old is primed to make his first appearance for his new club against Shamrock Rovers in the League Cup quarter final on Tuesday