Neither game will be remembered as a classic encounter, but a win for Kovacic's side against Argentina could potentially see them through to the knockout stages as group winners.
That would be something of a shock given the pre-tournament billing given to Argentina, in particular Barcelona's talisman Lionel Messi.
Kovacic, though, insists that Messi is the only advantage the South Americans hold, believing that the rest of their team is better to a man.
"Argentina depends a lot on Messi, although they are a great team in other positions," he told reporters. "He has to take care of them most of the time. He is phenomenal, he can resolve the game at any time."
He added: "We do not need to be too afraid of Argentina, we are singularly better than them, except Messi, and so we should behave, look at ourselves, not others."