Uncertainty remains over whether the Abbott government will attempt to claw back the $3 billion it gave to Victoria for the defunct East West Link, amid concerns denying the state infrastructure funding could cost it seats at next year's federal election.

State Treasury analysis reveals Victoria is on track to get just 20 per cent of Commonwealth infrastructure spending over the next five years – well below the state's one-quarter share of Australia's population.

The budget warns any move by Canberra to take back the East West Link cash would see that share drop to just 13 per cent.

While the Abbott government is keen to capitalise on Labor's controversial decision to scrap the $6.8 billion road link, strategists believe it cannot afford to short-change Victoria on infrastructure, with at least four federal Liberal seats vulnerable, including Deakin, Corangamite, La Trobe and Dunkley.