Gray was diagnosed shortly after the AFL season ended and underwent successful surgery to remove a tumour.
He will undergo a short course of precautionary chemotherapy, but the club expects he will make a full recovery and be ready to start pre-season training in November.
Port Adelaide’s doctor Mark Fisher said the post-operative treatment was important.
“The chemotherapy is a preventative measure to significantly reduce the chance of cancer returning,” he said.
General manager of football, Chris Davies, said the club was supporting Gray and his family.
“Robbie’s health and wellbeing is, as always, the most important thing to us,” Davies said.
“We are thankful the surgery went as well as it could have.
“The treatment isn’t expected to interfere with Robbie’s ability to begin pre-season training in November.”
– with AAP