Re-checking begins in Vic by-elections

Vote counting has resumed in two Victorian by-elections, with the Liberals expected to hold both seats.

The Liberals declared victory of the south-western seat of Polwarth on Saturday night, with candidate Richard Riordan leading the primary first preference votes on 49.57 per cent.

In former premier Denis Napthine's seat of South West Coast, Liberal Roma Britnell is leading the primary vote on 40.07 per cent.

However, it could take days for the final result to be declared as preferences are not expected to be distributed until Wednesday.

The Victorian Electoral Commission will spend Monday re-checking the votes and then turn its attention to provisional and postal votes.

South-West Coast has had 88 per cent of the vote counted, while 79 per cent has been counted in Polwarth.