Thiago Silva has admitted that he is expecting a tough test from Croatia next Thursday after Brazil recorded victory in their final warm-up match ahead of the World Cup.
Fred's goal earned the hosts a 1-0 win over Serbia on Friday night, but Silva believes that there can be no room for complacency as they prepare for the opening game of the tournament.
"Today we had a lot difficulty in the first half and this served to show us how much more difficult it will be against Croatia," the Paris Saint-Germain defender told reporters.
"Croatia should play the same way [as Serbia]. We must be very careful, learn our lessons from this game and believe that our opening match will be very complicated."
Brazil will also meet Cameroon and Mexico in Group A.
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Netherlands
Senegal
Ecuador
Qatar
England
USA
Iran
Wales
Argentina
Poland
Mexico
Saudi Arabia
France
Australia
Tunisia
Denmark
Japan
Spain
Germany
Costa Rica
Morocco
Croatia
Belgium
Canada
Brazil
Switzerland
Cameroon
Serbia
Portugal
South Korea
Uruguay
Ghana