Victorian Premier Jacinta Allan is reportedly likely to face a Labor leadership spill on Tuesday, amid weak opinion polling and an ongoing controversy over alleged corruption linked to the state's "Big Build" infrastructure programme. The prospect of a challenge points to mounting unease within Labor ranks over Allan's leadership and the party's electoral standing in Victoria.

The article's full details were not available beyond its headline, so specifics on who might challenge Allan, the scale of the polling decline, and the exact nature of the Big Build allegations are not confirmed here. It appears to relate to broader scrutiny of Victoria's major infrastructure projects and their management under the current government.