Davie Provan is confident that Celtic can progress to the Champions League Round of 16 in early December.
Despite the 2-1 loss to Benfica on Tuesday night, former Celtic star Provan is convinced that Neil Lennon's men can get the required victory over Spartak on December 5 as he feels comfortable Barca will get the better of the Portuguese side on the same night.
"And that's a scenario Lennon would have taken before a ball was kicked.
"It's a gilt-edged opportunity every Celts player must grab when the Russians come to Glasgow on December 5.
"Yes, they got what they deserved in the Stadium of Light. They lost to a technically-gifted Benfica team."
He added: "Spartak's campaign is over, they can't even qualify for the Europa League. So they'll have no incentive when they arrive in Scotland.
"But even if they make six or seven changes, they still have the quality to see off the Portuguese.