Sunderland have finally completed the signing of Brighton midfielder Will Buckley.
Buckley, 24, has joined the Black Cats for an undisclosed fee and signed a three-year deal.
The ex-Watford man played under Poyet during his spell in charge of Brighton and was a target in January when the Uruguayan returned to his former club to snap up fellow midfielder Liam Bridcutt.
Buckley spent three years at the Seagulls and made more than 70 appearances under Poyet, scoring 16 goals.
He travelled to the North-East on Wednesday to undergo a medical after Brighton accepted an offer understood to be in the region of 2.5 million pounds.
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Buckley could be handed his Sunderland debut at West Bromwich Albion on Saturday as the new Premier League season gets under way.
He is the latest man to arrive at the Stadium of Light in a major rebuilding programme undertaken by sporting director Lee Congerton and Poyet this summer.
The midfielder follows Jack Rodwell, Costel Pantilimon, Jordi Gomez, Billy Jones, Patrick van Aanholt and Santiago Vergini to Wearside, and Poyet will hope his arrival is not the last with a little more than a fortnight of the transfer window remaining.
The Uruguayan remains very much on the trail of Liverpool's Fabio Borini, for whom the Black Cats have had a sizable bid accepted.
The Italian has indicated his desire to remain at Anfield and fight for his place, despite his successful season on loan at Sunderland last term.
However, Poyet is confident he can persuade him to return to Wearside and play a key part in what he hopes will be a significant improvement on the struggles of the last campaign.