Premier Daniel Andrews. Credit:Simon Schluter

A sky rail to Melbourne airport is one of the options being considered by the Victorian government, the nation's lead infrastructure adviser has revealed.

Infrastructure Australia's acting chief executive Anna Chau told a federal government Senate estimates hearing on Monday that elevated rail for the $15 billion airport rail link could be an option.

In response to questions from the Greens' transport senator Janet Rice about whether elevated rail was being considered, Ms Chau said: "I understand that’s one of the options."

"There could be potentially different construction options, whether it's at grade, tunnel or elevated," Ms Chau said.