It seems Dortmund is not sure about hiring Serhou Guirassy anymore. Serhou Guirassy had an amazing performance during last season in Stuttgart and he was an effective player for this team. This made Dortmund think about hiring this player. But in the medical tests before signing the contract, the situation of Guirassy was not good enough and that's why there is going to be a delay.
Dortmund is ready to pay 18 million euros for Guirassy.
I think with the confirmation a few days ago from Fabrizio Romano's tweet, it is quite certain that Guirassy will become a Dortmund player but it seems that it is still being postponed due to medical test reasons. I don't know if something like this will happen and if Dortmund lowers their fees then Stuttgart will inevitably have to accept that.Dortmund is ready to pay 18 million euros for Guirassy.
The reason is that the medical test is one of the determinants for players to be able to join their new club and of course Dortmund knows the risks even though they are willing to accept Guirassy and pay him that amount of money. Now the decision lies with Stuttgart and it feels like this is a win win solution for both teams. Guirassy could still perform well and Dortmund certainly wants that in the future even if an incident like this occurs.