South Australia Police say it is too early to know whether there are other victims of a shopping centre Santa, who has been charged with indecently assaulting a child.

The 75-year-old was employed as a Santa Claus by Bluestone Recruitment on behalf of Southgate Plaza at Morphett Vale, in Adelaide's south.

Superintendent Graeme Adcock says it is alleged the aggravated assault of the seven-year-old happened on Tuesday afternoon, with the child's mother present.

"It's concerning because it impacts on the innocence of the relationship between Father Christmas and children and this incident occurred during that relationship," he said.

Police will allege the man had worked as a Father Christmas at at least three venues in both southern and northern Adelaide this month.

Superintendent Adcock says police are unsure if there are other victims at this stage.

"This is very early in the investigation, so it's not possible to actually say whether there's other victims, we're just alerting the public to the circumstances," he said.

A statement from Bluestone says the casual employee had a current police clearance and went through a rigorous recruitment process.

He has been given bail strict conditions which prevents and controls his contact with children.

He will face court late next month.