The tournament has been somewhat overshadowed following the incident surrounding Australia batsman David Warner's attack on England batsman Joe Root in a Birmingham bar. However, Cook believes the team which handles the pressure better will be the one who comes out on top, with other issues irrelevant to the outcome.
"It's such an exciting place for a player to be. We have almost played knockout cricket throughout this Champions Trophy and we have come here to try and win the tournament. We have got an amazing opportunity to try and do that tomorrow and both sides will be excited about that," Cook said.
"It's another day tomorrow. It's another game. What's gone on in the past has gone on. It has no relevance to tomorrow. It's which ever side handles the pressure well tomorrow. People in that side, in your own side, have to stand up and deliver and that's what you have to do."
Cook also revealed England will not risk spin bowler Graeme Swann for the game if they are not 100 per cent sure of his fitness.
"We haven't ruled him out totally. We will have to see how he trains today and pulls up tomorrow," Cook said. "There is one thing for certain - he won't be risked. Tredders (James Tredwell) is an exceptional bowler so we might be cautious with him and be sensible."
Cook also pinpointed the threat of South Africa batsman Hashim Amla as a key man they must try to stop.
"He is a massive player for them. He is a very good player and we saw that first hand last year in the one-dayers and in the Test matches as well, "Cook said.
"He's danger man for them and is one of their key players. If we can strike early, obviously with two new balls, it gives us that opportunity to do that.
"Our bowlers have bowled extremely well in those first 10 overs in this Champions Trophy so far and we will have to do that this time against South Africa. He's a fantastic player but all players are vulnerable early. If he gets in it's a danger for us."
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