Jude Bellingham has signed for Borussia Dortmund from Birmingham for an initial fee of £25m.

The 17-year-old English midfielder completed a medical in Germany on Thursday after Dortmund persuaded him to move to the Bundesliga club over Manchester United, who had also made him an offer.

It is understood Birmingham will receive a guaranteed £25m up front, with fees worth 'several millions more' potentially added on depending on appearances, achievements and milestones.

Bellingham - who Dortmund say has signed a "long-term contract" with the club - said: "I can't thank Birmingham enough for what they have done for me, not just this past year but since the age of seven.

"Of course I wish everyone associated with the club nothing but the best. Once a blue always a blue.

"However, I'm incredibly excited to have joined one of Europe's biggest clubs. The direction they are heading in and how much they help to improve young players made it an easy decision for myself and my family.

"I can't wait to perform in front of all the fans when they are back inside one of the most beautiful stadiums in the world."

Bellingham - who only signed a professional deal with Birmingham this month - follows in the footsteps of Jadon Sancho, who moved to Dortmund in 2017 and has since gone on to become one the stars of the Bundesliga and an England international.

Dortmund courted the midfielder, who turned 17 in June, for more than two years, amid stiff competition from most of Europe's top teams, including Chelsea, Real Madrid, Bayern Munich and, most notably, Manchester United.

United pulled out all the stops in their attempts to sign the box-to-box midfielder, offering him a tour of their training ground with Sir Alex Ferguson.

But the England U17 skipper has chosen Dortmund due to the club's long history of developing young talent and their policy of giving them the chance to play in the Bundesliga.

Dortmund's sporting director, Michael Zorc, confirmed Bellingham will be part of their first team, saying: "Jude Bellingham confidently chose BVB and, of course, was primarily concerned with the sporting perspective that we showed him.

"He has enormous potential that we want to develop with him in the coming years. He already has a surprising amount of quality in his own possession as well as against the ball, and on top of that, the player also has a strong mentality.