Their “reward" is the even more daunting task of a two-legged clash with runaway Premier League leaders Manchester City, starting at the Etihad tonight.
Smith, 26, said: “We're under no illusions. — Manchester City are probably the best team in Europe, if not the world, at the moment.
“We've a lot of respect for them, they have an amazing team and an amazing manager but in football anything can happen. No team is invincible.
“I was gutted when Kevin De Bruyne got injured the other week and hopefully he'll be involved as I want to play against someone like him.