Dortmund is a team that very often sells the best players they have printed and almost every season is like that. I think it will not be difficult for Dortmund to find a replacement for Bellingham which they sold to Real Madrid, because selling the best players is like a business for Dortmund so I will never be surprised when in the future Dortmund sells the best players again after they have trained them with pretty good. Likewise with Bellingham which they have sold to Real Madrid.
Actually, I think it was Bellingham's absence in the last round match that prevented Borussia Dortmund from winning the coveted title and interrupting the hegemony of Bayern Munich. Therefore, I would choose words with great care that it would not be difficult for Borussia to find a replacement for Bellingham. Moreover, now Bellingham cannot even theoretically go out on the football field and help Dortmund in the new season.