 Kọ itẹsiwaju fun paragirafi yii - Määttä jẹ yiyan akọkọ ni gbogbo agbaye ni 2011 Canadian Hockey League Import Draft, o si dun fun ẹgbẹ ọdọ ọdọ Finnish ni 2011 IIHF World U18 Championships ati 2011 : , 2012 ati 2013 World Junior Ice Hockey Championships. A mọ Määttä fun agbara igbohunsafẹfẹ rẹ ati IQ hockey, a pe orukọ rẹ si akojọ Finland fun Awọn ere Olimpiiki Igba otutu 2014 bi ọmọ ọdun 19. 