The youngster can’t legally sign a contract until he turns 17 on June 29th, but BVB may announce him this week.
The £20m that Dortmund pay Birmingham will be training compensation as opposed to a traditional transfer fee.
It is similar to the £7m agreement BVB made with Manchester City for Sancho in 2017.
Solskjaer misses out
In March, Man United invited Bellingham to their training ground in an attempt to convince him to join them.
Bellingham will finish the Championship season off with Birmingham before he moves to Germany.
The right-footed midfielder has appeared 36 times in all competitions this season, scoring four goals.