We can win, of course, and I am not anti-jinxing anything.
But we haven't played a knockout at the WC for 20 years and I would have been dead scared irrelevantly who we play, be it Brasil or Panama. It's a knockout match. In the last two knockout matches Croatia played after 1998, I was left speechless and heart broken. In 2008 the outsider Turkey scored on us in minute 122 (!) after we took the lead in the 119th minute. At EURO 2016 we were favorites against Portugal and they scored in 117th minute.
Think of it as Juve in CL. You always expect the worst to happen, no matter who we play

Though I am more confident when Juve plays, perhaps because there is a second leg in the CL knockouts.