IFK Gothenburg management are delighted for David Moberg-Karlsson over his move to Sunderland.
The 19 year-old winger passed a medical and signed a four-year contract with the Black Cats yesterday.
Gotheburg's sporting director Hakan Mild said: "It is obviously huge for David and IFK, and it is evidence of how well he has done.
"That a club in one of the four major leagues in Europe choose to tie up one of our players is a testament to our business."