Manchester United boss Erik ten Hag is well aware of the history of tomorrow night's clash with Leeds.
Despite the sacking of Jesse Marsch, Ten Hag knows the rivalry will trump all else.
He said, "It's about the match of the roses. It's definitely a big, big game. It's part of England. It's big for us. We have Man City, Liverpool but for our fans this game means so much and our players are aware of that and will know what to do.
"It's always sad if a manager is a colleague, gets sacked, so in general I don't believe in it, that you sack a manager and get better results, most of the time it doesn't work. Let the manager finish their work and make a good evaluation. But the pressure is high with decision makers at football and they turn. But if you see the facts, most of the time it doesn't work out well."
On Marsch's dismissal forcing a change in tactics, Ten Hag also said: "Definitely, you don't know. We have to be aware of that so when Jesse Marsch was at Leeds it was clear how they played, so the way of play, our system, their style. Now it's possible they change but it's also possible they don't change. We will only find out on the pitch tomorrow but we need good anticipation on that so we know what to do.
"Anticipation like we had against Villa when Emery came in, we had a week to prepare but not as much this time. We will see but we need to be proactive."