Spain welcome Ketsbaia's side on Tuesday knowing that a point will be enough to book their spot in Brazil next summer.
"I think this Spain team are the best in history. They've won everything for the past six years and have been the best team for so long," he told Reuters.
"We have a will to win on Tuesday, but we're also aware that a draw would be a good result. Words wouldn't be able to describe how I'd feel if we beat the world champions."
Spain recorded a 2-1 win over Belarus on Friday.