Last Thursday morning, the English wonderkid flew to Dortmund on a private jet, where he he successfully completed his medical before returning to Birmingham.
He became Birmingham’s youngest player in history when he made his debut against Portsmouth in the League Cup, and has continued to develop into one of the most exciting young prospects in English and European football.
He has gone on to score four goals and assist two others for the Blues in the Championship so far this campaign, in a team which has struggled in the bottom half of the table.
At national level, he has captained both the England U15s and U17s.
In January, Bellingham was heavily linked with a move to Man United and was even invited for a tour of their Trafford Training Centre.
Dortmund have won the race to sign him likely due to their track record of bringing young players through to feature in the first team at a young age, while they can also point to the success of Jadon Sancho who joined from Manchester City to become one of the elite wingers in Europe thanks to the opportunities he has been awarded.
Bellingham is still expected to feature in Birmingham's last game of the season against Derby this midweek before packing his bags for the Bundesliga.