Victorian Liberal leadership spill looms as Matthew Guy resigns from shadow cabinet

Victoria could have a new opposition leader within days as former Liberal leader Matthew Guy seeks the support of colleagues to topple Michael O'Brien in a party room coup his supporters are proposing to call as early as tomorrow.

Mr Guy has been considering a return to the leadership for a number of months but has consistently and publicly denied he would seek the job he held between 2014 and 2018, culminating in a devastating election defeat to Premier Daniel Andrews.

Mr O'Brien's been on notice since March to improve the party's prospects or face another challenge.

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But party sources say he's buried his head in the sand since then.

Many key problems identified by his colleagues were left unaddressed, including being inaccessible to colleagues.

He might have made moves to restructure his office, but repeatedly refused to take advice from key supporters, according to well-placed sources.

And he has continued to be unable to land a blow on Daniel Andrews.

Mr O'Brien has hung his hat on the fact that he fended off that spill motion 22 to nine.