The Andrews government will launch a costly High Court bid to block the Victorian Ombudsman from probing Labor's alleged rorting of parliamentary funds.

Mr Andrews office has been accused of directing upper house MPs to pool electorate officer entitlements in the lead-up to 2014's state election.

Victorian Premier Daniel Andrews. Credit:Justin McManus

The staff are alleged to have campaigned at the election – instead of working to support MPs in their parliamentary and electorate duties, as they are meant to.

The Court of Appeal last month ruled Ombudsman Deborah Glass was free to probe the allegations against Labor.