Rubuta ci gaba don wannan sakin layi - Dan asalin Ylitornio, Finland, Koivisto ya koma Rauma a matsayin matashi a shekarar 1998 don taka leda a Lukko, kamar yadda arewacin Finland ba ta da kungiyar SM-liiga a wancan lokacin. Bayan shekara guda da ya yi tare da ƙungiyar Lukko junior A, Koivisto ya fara wasa a SM-liiga a cikin kakar 1999 <unk> 2000, kodayake har yanzu yana raba lokacinsa tsakanin manya da ƙananan ƙungiyoyi. A cikin 2000, Koivisto ya bayyana a Gasar Cin Kofin Duniya ta U18 kuma ya lashe lambar zinare tare da Team Finland. Ya kuma wakilci Finland a 2001 da 2002
Gasar Zakarun Duniya, suna dawowa gida da azurfa da tagulla, bi da bi.