"We would be naive enough to call ourselves favourites in any game or competition that's simply because of the mentality of the teams," Cooper tried to play down the hype associated with his team.
While England sealed their pre-quarters berth with a game to spare, Japan's progress was not so convincing as the Blue Samurai juniors were held to a 1-1 draw by debutants New Caledonia in their last group league outing and are winless in two matches.
"They qualified quite convincingly as well. They will be a very tough opposition. Every game now will be competitive with good players on show. I see no difference tomorrow," Cooper tried to guard his team against any complacency.
"We do believe in ourselves. To play a team that can be a match and better than opposition. But that's easier said than done. Hopefully, the boys will deliver when it counts."
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Japan rested as many as nine players in their match against New Caledonia two days ago.
Cooper made it clear that his team is ready if the match is stretched into tie-breakers.
"If we are lucky enough to progress tomorrow, I am sure they will be penalty shootout at some stage in the knockout phase and we will be ready. We will be confident. It's about seeing the opportunity to experience something else rather than regret, which is our mindset."
"Enjoy it or not, we are not going to get away from it. I have talked a lot about their journey and development. The penalty shootout is part of that journey. We have tried to change the mindset in England about thriving on penalty shootouts."
He refused to reveal his plan as to who would replace their leading goal scorer Jadon Sancho, who has returned to join his club Borussia Dortmund.
"I don't know the team yet but there's no first team. I heard a little bit of A and B teams but that does not exit with England team whatsoever.
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