Manchester City signed Belgian winger Jeremy Doku from French club Rennes on a five-year deal on Thursday.
Doku, 21, will reportedly cost the European champions £55 million ($70 million).
“This is a great day for me, both personally and professionally,” Doku said in a City statement.
“Manchester City are the best team in world football, so to be joining them is something very special for me and my family.
“I am a young player with so much learning and improving to do. Working with Pep (Guardiola) and his staff, and playing alongside these work-class players, will make me a much better player.”
Doku scored 12 goals in 92 appearances for Rennes after making his breakthrough as a teenager with Anderlecht in his homeland.
He is City’s third acquisition of the summer, following Croatian internationals Mateo Kovacic and Josko Gvardiol.
The treble champions were looking for a winger to replace Riyad Mahrez, who left for Saudi club Al-Ahli.
City are also expecting to sign a midfielder before the transfer window closes on September 1 to replace Kevin De Bruyne, who is anticipated to be out for up to four months with a hamstring injury.
Wolves’ Matheus Nunes and Crystal Palace’s Eberechi Eze are reportedly targets after interest in West Ham’s Lucas Paqueta fell through due to a Football Association probe into the Brazilian’s possible violation of betting regulations.