Youngster Prince Obeng Ampem scored for Sibenik in their 3-1 defeat to runaway champions Varazdin in the Croatian top-flight.
The 21-year-old levelled for the visitors five minutes into the second half but could not match the promoted side.
Ampem snookered home a cross from the left to tally six goals in 24 appearances.
Sibenik are second on the table; five points behind Varazdin with one match to end the season.
Watch Prince Obeng Ampem's goal for Sibenik