Sheffield United boss Chris Wilder described Rhian Brewster as "one of the country's hottest properties" after signing the striker from Liverpool.
The 20-year-old has joined the Blades on a five-year contract for a club-record deal worth £23.5m.
The package for the England Under-21 forward includes a buy-back option for three years and the Reds will get 15% of any sell-on fee.
"He has been our number one target," said Wilder.
"At the top of the pitch we have one of the country's hottest properties from Liverpool and for him to sign permanently here is fantastic for everyone concerned.