A Liberal Party review into Scott Morrison's stunning election victory has warned the Coalition's future chances of forming government will remain "worryingly narrow" unless it improves its standing in Victoria and parts of NSW.

The review warns there is "no room for any complacency" within the party following the 2019 election campaign, recommending a "comprehensive impartial candidate vetting process" for candidates to avoid a similar situation where 10 Liberals were disendorsed during the campaign.

A victorious Scott Morrison takes to the stage on election night. Credit:James Brickwood

Undertaken by former senator Arthur Sinodinos and former New Zealand government minister Steven Joyce, the report - released on Friday - identified the federal budget as a "key turning point" in the party's electoral recovery and the almost single-handed successful prosecution of the campaign by Prime Minister Scott Morrison.

"The successful election result was achieved through sheer grit and determination from the top of the party, laid over a clear political strategy, with the help of a Labor opposition that made many missteps," it says.