The sides will go head to head in St Louis, Missouri as their preparations for Brazil kick up a gear in the United States.
The Ivorians have been unfortunate in the past two editions of the tournament, having been handed tough draws after being seen as outside favourites to spring a surprise.
When asked what his side must improve to succeed, Kalou replied: "Maturity, this is important. I think that we have been naive during the two previous editions of the World Cup.
"When we play at this level, it's the details that make the difference.
"It is not necessarily the case that the team who plays the best football comes out as winner of a contest.
"It is the one that is more focused on regaining the ball or the one that is more concentrated to defend and be like this for 90 minutes in the match.
"Often, we have played concentrated for just 45 minutes."
Ermin Bicakcic - who last week joined Hoffenheim from relegated Bundesliga outfit Eintracht Braunschweig - may not feature at Edward Jones Dome having struggled with injury through Bosnia's training camp on home soil.
Upon their departure to the United States, Spahic told reporters: "I can say that I am pleased with how we trained and the atmosphere around the team.
"We are leaving Bosnia, but we will carry Bosnia with us."
Each side have played just once so far in 2014, Bosnia losing 2-0 to Egypt in March while Ivory Coast played out a creditable 2-2 come-from-behind draw with Belgium - a result sealed by Max Gradel's late equaliser.
Friday's meeting will be the first between the nations.
