AAP, with astaff reporter
Victorians are still in the dark over why Ted Baillieu was dumped as the state's premier and replaced by Denis Napthine, Opposition Leader Daniel Andrews says.
Dr Napthine, who turned 61 on Wednesday, was gifted the top job on his birthday after Ted Baillieu resigned to become a half-and-a-bit term premier.
A tearful Mr Baillieu stepped down less than an hour after former Liberal backbencher Geoff Shaw issued a statement saying he'd quit the party because he had lost confidence in the leadership.
Mr Andrews told the Nine Network that no Victorian was "...really any the wiser about what happened last night."
"Mr Baillieu hasn't explained why he resigned. Mr Napthine hasn't explained the circumstances under which he became the leader of the Liberal Party.," he said.
"It's been a big day in state politics but we don't really know what's gone on."
Mr Andrews said Mr Baillieu's colleagues had treated him appallingly.
"They have leaked against him. They've been completely disloyal," he said.
The numbers in the Victorian parliament are on a knife edge following Mr Shaw's resignation from the party.
There are now 44 for the coalition and 42 to Labor, which will likely increase to 43 after the April 27 by-election for Lyndhurst, a safe Labor seat.
If Mr Shaw votes with the opposition that leaves the parliament deadlocked at 44-all.
Mr Andrews said it was up to Mr Shaw how he voted.
"It isn't a matter of accepting his vote," he said.
"All of my team will vote, If he votes with us well then that's entirely a matter for him."