The Victorian Opposition has promised to reopen the vacant Lilydale campus of Swinburne University as a higher education and TAFE provider if Labor wins the November election.

Swinburne has been searching for a buyer for the site since it was shut down in the middle of last year as part of a major restructure announced in 2012.

Expressions of interest from potential buyers close next week and although the site is zoned for educational purposes, the sale could be conditional on rezoning.

Mr Andrews says if a buyer is found and Labor wins the election, it would quash the sale and compulsorily acquire the site.

"Selling these buildings to a property developer, or anyone else for that matter, there's nothing legitimate about that," he said.

"I am opposed to that, Labor's opposed to it, and I'm giving everyone fair warning, this land is not for sale."