Chelsea have completed the signing of England Under-21s winger Noni Madueke from PSV Eindhoven in a move worth about £30.7m.
The 20-year-old joins on a seven-and-a-half-year contract, with the option to extend for a further year.
Madueke is the club's second signing in five days, following Mykhailo Mudryk's arrival in an £89m deal.
"I'm really pleased to sign with one of the best clubs in the world," Madueke told the club's website.
The Blues have also signed David Datro Fofana, Andrey Santos and Benoit Badiashile, plus Joao Felix on loan, during the January transfer window.