Arsenal youngster Chris Willock has joined Benfica on a permanent transfer.
The 19-year-old, who never made a Premier League appearance for the Gunners, has signed a five-year contract with the Portuguese champions.
Willock - an England U19 international - had shone for Arsenal's youth team in Premier League 2 and made two appearances as a sub in the EFL Cup last season against Nottingham Forest and Reading.
He told his new club's website: "I hope I can show what I can do on the pitch. I think we have a great team and we can achieve great things in the future."
Willock joined the Gunners' academy at the age of five and appeared for the Arsenal first team in a pre-season friendly in 2014 at just 16 years old.
Arsenal manager Arsene Wenger tipped him to be a breakthrough star that summer, stating: "Technically and tactically he integrated very well [with the big boys].
"Of course it's natural that he lacks a bit of power at that age but when he gets that he will be a very interesting player."