The two teams meet today at 12:30pm.
"It's difficult to play against every team in the Premier league so it doesn't matter if it's City or not," said Kovacic. "The other day we played against Aston Villa and it was a tough match so in this league every game is quite difficult.
"You need to give 100 per cent to win so we are ready for City just like we are for every opponent, and we will try to win.
"I always imagined that we could go for trophies because we have a great squad and we showed at the end of last season that we can fight for many titles.
"We've started quite well so we need to continue this run and be in all the competitions because we want to be there trying to win."
He added: "Obviously we have great players to play with the ball as well and to match them so we can hurt them. City is a great team and they know how to win because for many years now in the Premier League they have performed on an amazing level. We need to match that and then we will have a great chance to win"
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