Victoria's corruption watchdog has conceded it lacks resources to properly investigate police corruption and misconduct and has called on the Andrews government to beef up its oversight powers.

The request to expand the capacity of the Independent Broad-based Anti-corruption Commission follows a flawed investigation by Victoria Police into the shooting of a couple by officers at a CBD nightclub in 2017, which was recently settled with a record payout of more than $3 million.

IBAC Commissioner Robert Redlich.

IBAC Commissioner Robert Redlich, QC, confirmed to The Age that it was "constrained in terms of both its powers and resources in what it can investigate itself".

"IBAC is seeking additional resources to enable us to increase our capacity to undertake more of our own investigations and reviews, particularly in regard to our independent oversight of Victoria Police,” Mr Redlich said.