Ex-AFL star Shane Tuck knocked out in boxing debut

Former Richmond AFL player Shane Tuck has been taken to hospital after being knocked out during his professional boxing debut.

The ex-Tigers midfielder was caught on the chin with a hard right from Lucas Miller in the fourth round of their fight on Wednesday night on the undercard of the Anthony Mundine-Charles Hatley fight in Melbourne.

Tuck, who played 173 games for Richmond before retiring at the end of the 2013 season, stayed down in the care of his concerned support team.

He was then taken out of the ring on a stretcher and an ambulance was called to take him to hospital, although a spokesman said he was sitting up and talking.

"They are going to keep him in hospital overnight for observation but he walked to the ambulance," the spokesman said.