Brentford B forward Kolbeinn Birgir Finnsson has joined Borussia Dortmund for an undisclosed fee, subject to international clearance.
The 19-year-old agreed terms with German giants the BVB last week, before flying over to complete a medical and sign the paperwork.
Kolbeinn joined The Bees in the summer of 2018, signing a two-year deal from Groningen in Holland. He went on to make 45 appearances for Brentford B, scoring nine goals.
An Iceland youth international at every level from Under-16 to Under-21, last season he was called up to the senior national team for the first time, winning two full caps against Sweden and Estonia. In doing so, he became the first B Team player to win an international cap without playing in Brentford's First Team.
His first move away from the club was a three-month loan spell back to Fylkir in Iceland. He originally began his career with the Reykjavik side, making his full debut aged just 14. He is still the Club's youngest ever player. His summer move to the Pepsi Max League yielded 15 appearances and two goals, earning him a reputation as one of the division's brightest young talents.
He joins Dortmund to become only the second Icelandic player in the Bundesliga, alongside FC Augsburg's Alfred Finnbogason. Everton's Gylfi Sigurdsson also had a two-year spell in Germany's top flight with 1899 Hoffenheim, before joining Tottenham Hotspur.
B Team Head Coach Neil MacFarlane said: "We are proud to see Kolbeinn go to such a reputable club to continue his career. Each young lad that comes through the B Team has their own pathway and for Kolbeinn, he spent some time in the team and then some time on loan, and has become a better player because of it.
"We'll continue to push our players so that each one of them reaches their own potential, but of course that runs side by side with hard work and determination."