Bayer Leverkusen have completed the signing of hotly-tipped Dutch Under-21 international Ernest Poku from AZ.

The 21-year-old winger joins from the North Holland club on a deal running until 2030, with the transfer fee reported to be around €10m (£8.6m).

Poku completed his medical in Leverkusen on Monday before putting pen to paper on a four-year contract. Poku has already starred for AZ this season, featuring in the club’s opening day 4-1 thrashing of Groningen on Sunday.

During his time with AZ, Poku made 49 appearances, registering 11 goal contributions.

He also played an integral role in the Netherlands' Under-21 Euros campaign this summer, with the Dutch team reaching the semi-finals.

Poku also helped AZ to the knockout stages of the Europa League last term, as he registered three assists.

AZ lost to eventual winners Tottenham in the last 16.

In a message he posted to AZ’s fans on Instagram, Poku said: "After almost four seasons, it feels like it is time to make a move. Thank you AZ, thanks to all of you. To the AZ fans: your support has always been there. In good and difficult times."

Poku could be set to make his debut in Leverkusen's DFB Pokal first-round tie against Grossaspach on Friday, August 15.