Winger becomes seventh summer signing.
Sunderland have signed winger Will Buckley from Brighton and Hove Albion for an undisclosed fee.
The 24-year-old, who has already played more than 200 career games, has penned a three-year deal and is reunited with Gus Poyet at the Stadium of Light.
Buckley began his career at Rochdale, making 68 appearances for the Spotland club and scoring 13 goals before joining Championship side Watford in January 2010.
His rise continued at Vicarage Road, with another 43 appearances made before Poyet came calling in summer 2011, taking the youngster to Brighton.
The winger soon established himself as a regular at the Amex Stadium and made over 100 appearances for the Seagulls, scoring 19 goals.
Buckley becomes Sunderland’s seventh summer signing, following the arrivals of Jack Rodwell, Costel Pantilimon, Jordi Gomez, Billy Jones, Patrick van Aanholt and Santiago Vergini.