In early August, Koeman confirmed the midfielder’s future lied away from Goodison Park.
A hamstring injury has since ruled Barkley out of the start of the Toffees’ Premier League campaign, leaving Koeman in the dark over his future.
“I don’t know,” the Dutchman said. “There is no update about his situation.”
Asked if Barkley was in his plans for the forthcoming season, Koeman added: “I will wait until the end of August.”