It is understood the 23-year-old put pen to paper following a medical on Wearside this morning after the Black Cats reportedly agreed a fee of £5million with Cardiff.
The former Newcastle striker becomes Roy Keane´s third summer signing after the capture of Greg Halford and Russell Anderson.
© Copyright PA Sport 2007, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: https://www.givemesport.com/writeforgms