Kris Commons says Celtic "proved the doubters wrong" by progressing to the last 16 of the Champions League.
Commons scored the winning goal from the penalty spot in the 2-1 victory against Spartak Moscow.
"On our day, I think we can beat anyone," the midfielder said. "We have proved that. No-one will fancy coming to Celtic Park and playing us.
"We have turned boys into men and we have young players who are hungry for the game."
Celtic went into the game against Spartak knowing they had to better Benfica's result against Barcelona to progress.
Commons was taken off on a stretcher following Kim Kallstrom's tackle, the Spartak man following him from the field after receiving a second booking for the challenge.
And he described the nerves he felt when given the chance to fire Celtic into the lead late on.
"Obviously I wouldn't have liked the penalty to hit the bar - that was a bit edgy! But I wanted to go straight down the middle, nice and high," said Commons.
"My only worry was that his feet would still be in the middle with him diving, so I wanted to go as high as possible without ballooning it over."
Celtic could face Manchester United, Malaga, Juventus, Bayern Munich, Borussia Dortmund, Schalke or PSG in the next stage of the tournament, the draw for which takes place on 20 December.