A MAN has been arrested over the stabbing of a Good Samaritan near Crown Casino.

The 21-year-old man was arrested on Grimshaw St, Greensborough, at 2.45pm today after an attack on Friday night.

The victim, 24, was allegedly stabbed in the abdomen when he went to to aid of a woman on Yarra Promenade.

The woman was allegedly being assaulted by a man at the time.

Police had earlier released an image of a man they were looking for in connection to the incident.

Two others were arrested but are not believed to be linked to the stabbing.

The three are being interviewed by police.

mark.buttler@news.com.au