UEFA: a fourth substitute to be allowed during extra time in European Cup matches from 2018-19
An additional substitution will be now be allowed during extra time (after a maximum of three substitutions during normal time) in the Champions League, Europa League, Super Cup, Women's Champions League, as well as during the qualifying phases of the Champions League, Euro 2020, Women's Euro 2021 and in the Regions' Cup, according to UEFA on...
