Celtic manager Ronny Deila believes his side can pull off a remarkable comeback and reach the Champions League play-offs.
Legia Warsaw lead 4-1 going into this evening's second leg at Murrayfield following last Wednesday's match in Poland.
Deila said: "I haven't given up. It's possible. If we turn this around it will be a massive night. That is what we are wanting, dreaming of, but behind that it needs a good performance.
"Last week was a hard day but I have had many days like that in my career. That gets you reflecting and you have to use your experience to turn it around and bounce back.
"The boys have been working well this week, we have been talking a lot and now we are looking forward to the game."
If Celtic fail to overturn the deficit they will go into the play-off stage of the Europa League.