Sub On Play On is Bet365’s latest feature, it simply allows your selection to remain active once your selected player is substituted off the pitch, as you’ll then be backing their replacement.
I.E if you back Mohamed Salah to Score 2 or more goals and the Egyptian only scores once before being substituted for Darwin Núñez, your selection will remain valid and will even come off should Nuñez score in the same match as you ultimately backed Salah and his potential replacement to score two goals.