The Three Lions will be playing in front of a reduced crowd in Sofia after Bulgarian fans were found guilty of racist behaviour in their games against Kosovo and Czech Republic in June.
"It was just about, if it does happen which unfortunately it does sometimes, what we need to do and what the protocol is," said Tomori.
"He just briefed us about what was going to happen. We should be prepared for that because we know that sometimes you can go to countries and stuff like that can happen unfortunately.
"We are just there to play the game and whatever happens in the stands, we'll just let the authorities deal with that."