The Candystripes have completed the signing of the Bray Wanderers midfielder as manager Declan Devine continues to build his squad ahead of the new season
Donegal native Houston, 23, joins the FAI Cup winners after spending two seasons at the Carlisle Grounds. The midfielder began his career at Fanad United and also enjoyed spells with Finn Harps and UCD.
Speaking about the signing, Candystripes boss Declan Devine said that he is 'delighted' to have signed such a 'quality player'.
"Sean is a quality player who can play in a number of positions," he told the Londonderry Sentinel. "He's a box-to-box player who can also play in defence."
He added: "In my opinion he was Bray's best player last season, so I am delighted to have got him and Paddy Kavanagh"