Dortmund is ready to pay 18 million euros for Guirassy.
I saw the news yesterday, but I wasn't paying attention until I read your post. If the injury seems to be serious, I believe Dortmund will be cannot sign him, but, if it is minor and he will be able to play at the start of the season, I am sure Dortmund will be able to complete the contract. Let me use Hakim Ziyech as an example. He almost joined Al Nassr at the beginning of last season, but the contract was terminated after it was discovered he had an injury. It makes no sense that they signed a player and then didn't use him for the first season, it seems to be a waste of money, Dortmund is interested in signing Guirassy after a successful season with Stuttgart, the player scored 25 goals in 25 games last season, and I believe Dortmund wants to sign him so they can compete for the title next season.
That is exactly my point, Kompany successfully moved Burnley back to the Premier League the previous two seasons, but they had a poor performance last season and were relegated. There must be a reason for their poor season. In my opinion, Burnley did not provide him with the important players to compete in the Premier League, but since he is the manager of Bayern Munich, we can expect to see something new from him.