Ms Allan's first cabinet was sworn in at Government House on Monday ahead of state parliament returning on Tuesday from a four-week break after the shock retirement of Daniel Andrews last week.
The Bendigo East MP ceded her high-profile roles as minister for transport infrastructure and the Suburban Rail Loop to Assistant Treasurer Danny Pearson as part of the cabinet reshuffle.
New Deputy Premier Ben Carroll has become minister for education and medical research.
Tim Pallas, who vied for the deputy premier role, remains treasurer after speculation he could follow Mr Andrews out the door.
Mr Carroll's replacement as public transport minister is Gabrielle Williams, while Natalie Hutchins swapped education for jobs and industry and returns to the treaty and first peoples portfolio.
In a major promotion, Harriet Shing takes over from Colin Brooks as housing minister after Labor released its landmark housing statement last month.
Eltham MP Vicki Ward was elevated into cabinet, filling Mr Andrews' vacant spot, as minister for prevention of family violence and employment.
The new-look cabinet met for the first time on Monday afternoon to discuss policies.
Victorian Opposition Leader John Pesutto also revealed his new shadow ministry on Monday, prompted by Matthew Bach stepping down from cabinet to take a teaching role in the United Kingdom.
Under a raft of changes, former opposition leader Matthew Guy returned to the frontbench as shadow public transport minister after leading the coalition to a second election drubbing in November.
Contentious reforms to bail laws are set to be debated by the upper house this week, with amendments expected to be moved.
The death of Indigenous woman Veronica Nelson in custody in January 2020 has been the catalyst for the proposed changes to bail laws, which were tightened in 2018 after the Bourke Street rampage and later dubbed an unmitigated disaster by a coroner.