Justice Michael Lee will deliver his decision in the defamation case of Bruce Lehrmann, who claims he was defamed in a broadcast where Brittany Higgins accused an unnamed colleague of rape.

The case has been described as a 'quasi-criminal trial' and has incurred costs of at least $10 million.

Key witnesses include Lehrmann, Higgins, and Lisa Wilkinson, with the judgment set to address identification, truth defense, and potential damages.

The trial scrutinized the actions of Network Ten and Lisa Wilkinson in airing the sexual assault allegation.

The judgment will be announced at 10.15am in Sydney and will be available via livestream on the Federal Court's YouTube channel.

Damages for non-economic loss may be awarded to Lehrmann if the defenses fail, with a maximum cap of $459,000.