Middlesbrough have confirmed the signing of striker Will Lankshear from Tottenham.
The 21-year-old joins the Championship side for a fee of up to £20m including add-ons, Hayters understands, with £12m of it guaranteed.
Hayters reported last month that Spurs would consider offers of around the £20m mark for Lankshear.
He has signed a five-year contract with the club.
“Middlesbrough is such a massive club over the years; I deem it to be a Premier League club,” Lankshear said.
“The project here really excites me. I can’t wait to get started and be part of the journey, and get this club back where it belongs.
“I feel like now is the best time in my career. I’m ready to hit the ground running and help this club.”
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Lankshear’s departure is expected to be followed by more exits as boss Roberto De Zerbi looks to continue his summer rebuild.
Lucas Bergvall is attracting interest from Newcastle and Nottingham Forest, but Spurs have so far rejected offers for the midfielder.
Djed Spence could also be sold if there is a big enough offer, with Inter Milan keen.
Spurs are also willing to listen to offers for Cristian Romero, Guglielmo Vicario and Richarlison.