I don't see how they can.
The National Coalition plus True Finns plus Centre form a majority center-right coalition. Omit any one of the three, and a center-right coalition is impossible.
Centre plus the Social Democrats plus most of the remaining Left parties can form a center-left coalition.
Centre plus National Coalition plus Social Democrats could conceivably form some sort of center coalition (how well it holds together is another story).
There does not seem to be any sort of viable coalition that does not HAVE TO include Centre.
Or am I missing something here?
The chairman of the Centre party said that they are in opposition.