Network Ten is expected to begin sacking journalists after failing to obtain sufficient voluntary redundancies, a union says.

The cuts are part of a plan by Ten to chop 100 journalist, camera and producer positions, or about one-third of its national news staff, the Media Entertainment and Arts Alliance (MEAA) said on Tuesday.

The MEAA said it had been in talks with Ten about the cuts but decided to withdraw a Fair Work Australia application accusing the broadcaster of being secretive about the redundancies.

In a statement today, the MEAA said Ten had failed to provide details including the likely final number of voluntary redundancies and the redundancy procedure.

Around 40 journalists are expected to be sacked, News Ltd reports.

On Friday, Ten confirmed it had fired 10 people in its Queensland newsroom.

AAP