However, on the subject of getting into the last 16 of the competition, Brown said: "It would be fantastic, but we need to remember that Zenit are a fantastic team".
The 1-0 win at Celtic Park was the first-ever meeting between these clubs so I guess you could say Celtic have never lost!
"But you have to be able to play quality football and to do that you have to stay calm and retain your emotions, no matter how the game goes. We know it's going to be hard but we believe that we can do it".
"European football is notoriously very hard for ourselves but I think we showed in the first leg how well we can play".
"We know they are good players and they have quality, but so do we and we showed that last week".
"Our belief has always been there".
"But what we showed in the first leg is that if we play with our quality and to the top of our level then we can match any team".
"They will be expected to go through over the two legs, so my mindset hasn't changed".
Army unsure Boko Haram abducted schoolgirls in Yobe attack
He said that some parents have also reported to the school authority that their missing children had reached their homes safely. Parents of the missing students have asked that the Federal Government acts fast and locate their wards before it's too late.
Roberto Mancini is unlikely to tinker with his side who were unlucky to come out second best in the first leg.
The match at Celtic Park was Zenit's first competitive fixture since mid-December, owing to the winter break in Russian Federation, but Smolnikov refused to believe that his side lacked match fitness.
"Yes he's a good player with a great left foot", he said in a press conference on Wednesday, when asked to rate Tierney and the Celtic team.
"I am confident that we can improve tomorrow".
"But at the same time we are a good team, the only problem is we didn't play for two months". All the players are ready.
"In all of the qualification games we've played since I've been at Celtic it's been important home or away to retain the emotion of the game".
We're going to need to up our game here because we know it's going to be hard, but we believe we can do it.