A young man has suffered injuries to his arm when he was set upon by a man wielding a machete early Monday morning.

The 22-year-old was walking down Murray St, Gawler when he was approached then allegedly assaulted by three men at about 12.10am.

One of the men was allegedly wielding a machete and the Gawler South man suffered a serious injury to his arm in the incident.

His injuries are not considered life-threatening and he has since been released.

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Police said the attack was “not believed to be random”.

The street was closed as police investigated, however, 7NEWS understands the victim is not being co-operative.