This follows the defender's departure from Shamrock Rovers
Shelbourne have announced Sean Gannon as their first new signing for 2024.
Gannon joins the Reds, having helped Shamrock Rovers to four League of Ireland titles in-a-row.
The 32-year-old ex-St Patrick's Athletic and Dundalk full back has been part of 10 league winning sides.

Allianz Hurling League Finals Set for Sunday Showdowns
Maguire in Contention as Kildare's Walsh Shows Resolve at Aramco Championship
Sunday a.m Sport Update
Ulster Fight Back to Edge Ospreys and Reach Quarter-Finals
Arsenal Stunned by Southampton in FA Cup Exit
Kildare Clubs Celebrate Success in AIL Rugby
Kilkenny Overcome Brave Kildare in U20 Leinster Hurling Opener
Haaland Hat-Trick Fires Manchester City Past Liverpool in FA Cup Quarter-Final