Australian Olympics Committee Chef de Mission Kitty Chiller said Palmer and McKeon's behaviour was 'unacceptable and they breached disciplinary protocols'.
'I have raised the need for the Swimming Team Leader to ensure he is aware of his athlete's whereabouts when leaving the Olympic Village and that the swimming athletes observe the 2am curfew,' she said.
As a result, the pair have been put on a strict curfew for the remainder of the Olympics and banned from the closing ceremony.
McKeon wrote on Twitter: ‘To clarify, I've followed AOC safety protocol in not travelling to village alone. My error was not texting my team manager.#noclosingforme’