What happened: The package includes another $6 million in potential add-ons. Personal terms remain pending, while Herrington's Colorado contract runs through 2029 with an additional club option.
Why it matters: Hull earned promotion to the Premier League through the Championship playoffs. The 18-year-old previously drew a rejected bid from Barcelona, with Liverpool also scouting him.
By the numbers: Herrington has made 17 MLS appearances this season. He started twice at the 2026 World Cup after making his senior international debut in March.
What to watch: The clubs must complete personal terms and the remaining transfer formalities before the move becomes official.