Career
He was a Fédération internationale de football association listed international assistant referee from 1990 to 1998. Yli-Karro officiated 23 international matches, 16 matches at the Union of European Football Associations club competitions and several youth internationals. He was appointed as an assistant referee to the 1994, 1993 Fédération internationale de football association World Youth Championship and 1994 Gulf Cup of Nations.
Yli-Karro and Arne Eriksson are the only Finnish referees at World Cup finals so far.
He lives in Western Finnish town Rauma and is working as a headmaster on a high school at Säkylä municipality.
