Hrinak started refereeing in 1982 and became an international in 1993. He refereed a great number of UEFA Cup matches, a few Champions League matches and qualifiers for big tournaments. He retired at 45 at the end of 2009. He died suddenly in 25. July 2012.
Having Lubos Michel as a fellow country man doesn't help, what is the chance of a country like Slovakia getting two referees for an international tournament? As far as we know his first and only tournament was Euro U16 1994 in the Republic of Ireland.
When Michel retired Hrinak became the new number one ref of Slovakia. In 2009 he was a Premier Category Referee.