The Black Cats have seen plenty of players leave too, including stalwart Lee Cattermole and high earners Bryan Oviedo and Donald Love. Here, we round-up every deal the North East club has concluded during the summer. Scroll down and click through the pages to see the full list.
5. IN: George Dobson
Sunderland managed to land the energetic ex-Walsall captain after the club's relegation, for an undisclosed fee. Photo: Frank Reid
6. OUT: Ethan Robson
The midfielder has gon out on loan to Grimsby Town until January. Photo: Jack Thomas
7. OUT: Bryan Oviedo
The left-back re-joined FC Copenhagen this window. Photo: Simon Cooper
8. IN: Conor McLaughlin
The Northern Ireland international signed on a free transfer. Photo: CameraSport - Kevin Barnes