The four-year-old is entered in the Arqana Arc Sale next month and Rouget told the Racing Post he will be at the Paris auction after coming from last under Fabrice Veron to defeat Nightflower by 1 3/4-lengths at Baden-Baden.
“He’ll run in the Arc and he’s entered in the Arc Sale on the eve of the race. He’ll go through the ring with that entry,” Rouget said.
“I could see him doing well in Australia.”
Prince Gibraltar finished seventh behind Treve in the Prix de l’Arc de Triomphe last year and was winning for the first time since the Group II Prix Greffulhe at Longchamp in May 2014.
Sirius finished three-quarters of a length away third in front of Palace Prince with Australian Bloodstock-owned Goldstream fifth.