Try this one regarding the medicals:
https://www.footballorbit.com/what-a...tball-medical/
Key lines:
"The discovery of latent injuries during a medical may lead to transfer deals being scuppered at the last minute, much to the embarrassment of the player and the selling club. Typically, clubs hastily agree to sign players on transfer deadline day “subject to a medical”. This will allow the deal to go through without the need for the lengthy process."