The Black Cats will face stern competition in the race for promotion, with a number of their third tier rivals having already completed some eye-catching deals – which could prompt some worry. Scroll down and click through the pages to see EVERY deal completed in League One this summer so far:
17. Sunderland
In: Conor McLaughlin (Millwall), Lee Burge (Coventry City), Ruben Sammut (Chelsea), Michael Collins (Everton), Ahmed Abdelkader (NAD Polis Chrysochous)
Out: Lamine Kone (Racing Club Strasbourg), Reece James (Doncaster), Luke Molyneux (Hartlepool United) Photo: Clive Brunskill
18. Wycombe Wanderers
In: None
Out: None Photo: Jordan Mansfield