http://www.nhs.uk/conditions/long-qt-syndrome/Pages/Introduction.aspx
https://www.bhf.org.uk/heart-health/conditions/cardiomyopathy/hypertrophic-cardiomyopathy
Not saying it is these but here are 2 examples that are very much possible.
Grosiki would be a good signing and would improve our left side immensely. He's skillful and pretty pacy but will frustrate with his decision making. I didn't see enough of ranocchia to comment.