Victoria police say an unnamed youth has potentially life-altering injuries after being robbed and attacked at a playground in the city.

Police have issued a news release saying the youth and a friend were in the park at about 9 p.m. Tuesday night when two other youths, aged about 15 or 16, took their longboards.

The victim says he approached the suspects who assaulted him with a weapon and then fled.

Investigators describe the youth's injuries as non-life-threatening, but say he remains in hospital and the unprovoked attack has left him with wounds have the potential to change his life.

The suspects are both described as Indigenous, about 5'3", and one was wearing a red hat, while a photo of one of the longboards shows it is brand new, full sized and distinctive with a dark blue, white, grey and aquamarine pattern.

Because of the location of the assault and injuries suffered by the victim, police say they want to ensure residents of the area around the Mayfair shopping centre are aware of it, and they urge anyone with information to come forward.

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