Koeman is among a host of big names that have been linked with the Celtic job.
“Its an option that I am thinking about very seriously,” he told De Telegraaf about Celtic.
Koeman insists he has other options, should he not become the new Celtic boss.
He added: “There’s more interest from right and left. I cannot mention names, but these are all foreign clubs.
“Within one week I hope to determine where I go.”
