Northern Ireland boss Michael O'Neill preparing side for visit of Finland . Finland boss Mixu Paatelainan was his assistant at Cowdenbeath . Pair previously met during an entertaining 3-3 international friendly in early days .
Northern Ireland boss Michael O'Neill preparing side for visit of Finland . Finland boss Mixu Paatelainan was his assistant at Cowdenbeath . Pair previously met during an entertaining 3-3 international friendly in 2012 .