Liverpool have been following new signing Divock Origi for the past three years.
The youngster impressed at the World Cup but had been on the Reds' radar long before that, having been tracked since he featured for his national team's under-15 side.
Origi travelled to join up with Liverpool's pre-season tour of America so the deal could be completed.
"I am very happy and delighted a club as big as Liverpool showed interest in me. I'm very excited," he told liverpoolfc.com.
"I know it's a club with a great history, great fans and a lot of great players.
"For me, Liverpool is one of the greatest clubs in the world and I'm very excited to be part of this great history.
"I am very proud to sign for the club. I'll give everything for the club, like I did when I was small and did for Lille.
"I'm hoping we can achieve great things together."
