Shane Griffin’s capture is a real coup for St Pat’s, says manager Stephen O'Donnell.
Former Reading fullback Griffin completed his move to Inchicore after three seasons with Cork City and said: "I'm delighted with this fresh challenge at Pat's.
"There's a great group of players and staff here.
“From speaking to Stephen, the group is really ambitious to do well and that’s something I want to be part of.”
Saints boss O’Donnell said: "I'm delighted to sign Shane. He’s someone I came up against on the pitch from my time with Dundalk and always thought very highly of him.
“Playing against him, he always impressed me as a great athlete so we’re thrilled to get a player of his calibre into the club.
“He has achieved a lot in the game to date and is hungry and ambitious to achieve more and that’s what we want.”
Griffin made over 80 appearances for the Rebels and new City boss Neale Fenn said: “Everyone at the club would like to thank him for the contribution he has made.”