With two Group G games left, a win for the Hoops would ensure qualification into the knockout stages while eliminating the Portuguese side with a score draw being enough if section leaders Barcelona beat Spartak Moscow.
Speaking at Glasgow airport ahead of the flight to Lisbon, the former Celtic defender, buoyed by the home win over Barca earlier in the month and the away win against Spartak earlier in the tournament, said: "We are in a great position.
"There is more pressure on Benfica because they really need to win the game.
"But it is a difficult game, it's a Champions League match away from home and we really respect Benfica, we think they're a really good side.
"But the confidence is there, we have shown that we can play away from home so why not go out and nick that vital point?
"They are probably going to go all out and win the game and they are going to be strong at home, a good side going forward, well organised but at the end of the day we have picked up a lot of confidence from our away games and we know that if we defend really well we can get something from this game."
Benfica will be boosted by the return of Enzo Perez and Ezequiel Garay for tomorrow's tie.
The players cost the club £5million each and their return will be invaluable to a side that has struggled with injuries all season.
The Argentinian duo both pulled out of their country's squad last week for the friendly against Saudi Arabia to be ready to face Celtic.