The font used on the Croatia World Cup jersey is said to be the same font used the previous years. The only difference is that there is now a crest on the numbers.
The font contains the alphabet and numbers, Latin 1 accented letters, and some punctuations and symbols. The font also have accented letters used in Croatia, specifically
Č Ć Ð Š Ž
The font is available in both Open Type and True Type font formats.
A preview font with very limited glyph set is available for download to give you a chance to test the font. The instructions on how to get the full font is is indicated in the copyright field of the preview font and in a text file included in the preview font download pack.
Download the TTF and OTF preview font here or here.
Click on the SKIP AD button when you get to the linked page. The button is shown, after a short delay, near the upper right corner of the page. A click on the SKIP AD button starts the font download.
Hope you like my font.