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.
Bellingham's absence in the last game was due to an injury which required him to step aside on the pitch. Maybe that was the last game he wanted to play before leaving Dortmund and joining Real Madrid. But fate said otherwise and surprisingly Dortmund failed to win the bundesliga title and at the same time Bellingham failed to get a parting gift.
But as a star player Bellingham must learn to accept the harsh reality and he hopes to start a new step with Real Madrid. It is certain that Dortmund will still find it difficult to lose Bellingham during that time and there is no guarantee that there will be someone like him at the moment.
It seems that Bellingham could be played maybe for the last 20 minutes or during the first half in the match, because in that match also Bellingham was on the bench in Dortmund skuad last match in the last season against Mainz. But, it is possible that their coach is very worried about Bellingham condition safety and health. Because it would certainly be dangerous to force him to keep playing, while in fact the condition is still not entirely good. But if at that time Bellingham suffered a severe injury, then of course Bellingham would also not be brought into the match, but in fact Dortmund still brought him but him only became a bench filler. But yes, despite Bellingham failure to give the title to Dortmund in the last season, at least Bellingham will still have a great chance with Real Madrid in the next season later to win many trophies there.