Celtic will know their amazing victory over Barcelona will mean nothing if they fail to come away from Benfica with a positive result.
The Scottish champions' enthralling 2-1 win over the Champions League favorites was one of the best moment of the last round of matches, and Celtic manager Neil Lennon will ask for more of the same against a Benfica side that are equally capable of creating an upset or two.
"The game against Barcelona was good, but there are two matches to go," Lennon said. "I played here in 2007 and I know how it is. We have to be defensively at our best and attack when we can. If we fail to qualify now it would be a wasted opportunity. But the job is not yet done.
"At home against Benfica, it was a bit of a tactical battle. Nemanja Matic has been very important for Benfica. The full-backs and center-backs too. Melgarejo is fantastic. I know Lima well from the time we faced Braga.
"Luisao is very experienced; I played against him. He's always on his game and we know how important he is for Benfica. Also Oscar Cardozo is a terrific striker, but Benfica are not just about individuals, they are strong as a team and don't lose their identity when the coach changes some players."
Barcelona, who travel to Moscow to face Spartak, top the group with nine points, while Celtic are two points behind on seven. Benfica are third with four points, with Spartak on three.
"Right now Celtic are in a better position to qualify than us and Spartak," Benfica manager Jorge Jesus said. "Benfica can qualify but we need to beat Celtic. They are as strong at home as they are away, but a bit stronger in Glasgow due to that fantastic atmosphere.
"In Lisbon, they'll play in a stadium that is almost the same, where Benfica's fans really help us a lot. The Celtic fans sing 'You'll Never Walk Alone' and that's how it feels for us, because our fans make it easier for us.
"Celtic have been the surprise package in this group because, after they beat Barcelona, the whole group changed completely. Right now they are the team who, apart from Barcelona, of course, have the best chance to qualify."
To watch Benfica vs Celtic Live Stream, click here.
Expected lineups: Benfica: Lopes; Almeida, Luisao, Jardel, Luisinho; Matic, Bruno Cesar, Gaitan, Nolito; Rodrigo, Cardozo.
Celtic: Forster; Lustig, Ambrose, Wilson, Matthews; Brown, Wanyama, Mulgrew, Commons; Samaras, Watt.
Prediction: 1-1
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