"There are going to be a lot of people watching that game, it's a bit weird." said Fagan, who set up Caleb Folan's winner in the opening-day victory over Fulham.
"The manager going - there is going to be a lot of pressure on the players. The fans, I'm not too sure what atmosphere they're going to create, whether they are going to be behind the team or against them, it's a weird situation.
"The fans can be amazing up there, they can be a 12th man for their team, or they could be a 12th man for us. We will just have to wait and see on the day what sort of atmosphere they create.
"We all see it as an opportunity for us to get points out of the game. I don't know what's happened this week in training, but I'd say it's mayhem up there at the moment.
"Nobody knows what is really going on. It is a chance for us to go up there and get three points."