Also referees can have injuries, we all know, but you never expect them to suffer physical issues.
This happened to Italian referee Nicola Rizzoli, that was supposed to do next Saturday Serie A big match Juventus v Napoli.
Rizzoli, who refereed the World Cup final Germany v Argentina in 2014, got his calf injured this morning while training.
Now Serie A officials have to choose a valid substitute to replace him.
Source: transfermarketweb.com