Since his return, the Celtic manager has sometimes been referred to as 'Box-Office Brendan'. It's not hard to see why.

Saturday's stunning 6-0 Scottish Premiership triumph over St Johnstone in Perth saw Celtic play the scintillating football that made people far and wide - yes, I am talking about you, Borussia Dortmund - sit up and take notice. Brendan Rodgers is now in his element with this Celtic team.

Not bad for a team that doesn't play good football. That was the Irishman's box-office mantra as he addressed the media inside McDiarmid Park at the weekend. The 51-year-old has something to say and in his inimitable style, he got his message across. Rodgers said: "Not bad for a team that doesn't play good football. That's what we were told last year, wasn't it?

"That was the accusation. We were too slow, we didn't play football. We didn't score enough goals so not bad for a team that isn't playing good football."

For those in any doubt, this is a Rodgers Celtic team - pace, power, speed accuracy, unpredictability and clinical. The work rate on and off the ball is as relentless as it is amazing. The manager knew what he was watching against St Johnstone. As he stated: "This was everything you'd want from your team. Intensity, technique, hunger quality."

Not bad for a team that doesn't play good football. Did you know including friendly matches Celtic have scored a total of 179 goals since Rodgers rejoined the Parkhead managerial fold? Not bad for a team that doesn't play good football.

Now the question is how far can Celtic go. Are they as good as Rodgers and the supporters think they are? Well, Tuesday night is the acid test for the men in green and white. The Yellow Wall and 81,000 inside the Signal Iduna Park stadium as Celtic go head-to-head with last season's Champions League runners-up on Matchday Two of the league phase. This is the ultimate step up in class for the Scottish champions. It was always going to be.

However, if you canvass the Celtic supporters they are travelling to Germany, not with blind faith or hope. There is genuine optimism that they can get a result. They genuinely believe that this Celtic team can win against one of European football's heavyweights in one of the most revered arenas in club football. This time a year ago such thoughts would have branded preposterous.

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Take the ultimate Cinderella story man Liam Scales for example. Scales is living the dream at Celtic. He bagged the crucial opener against Slovan Bratislava at Parkhead in the opening day 5-1 mauling of the Slovaks.

It is a testament to the feel-good factor coursing through this club that Scales admitted that the Celtic players have no fear of the Yellow Wall and that they are not going to Dortmund to sample the atmosphere as tourists. Celtic under Rodgers are going to Germany to play to win. Scales said: I believe we can go there and win it. We just need to go and play the way we have been playing and see where that takes us. They are a top, top side and have been in a Champions League final and we know it's going to be difficult.

"We also need to go there with a bit of confidence knowing that if we play our game we can go and win. If we play like we have been playing in the league it gives us our best chance of getting a result and that's what we plan to do. We're playing good football, we're winning games, keeping clean sheets. That's given us the most confidence that we can possibly have going into a game like this.

"It's going to be very difficult and we'll do very well to get a result but we believe we can."

There's a swagger about this Celtic team. It stems and emanates from the manager. Rodgers is an elite-level manager who believes he belongs in this exalted company. He is slowly but surely translating that same vibe to his players. The match-up against Dortmund will put the learning, development and progress to the test thus far. This is the stage where Rodgers craves success the most.

He may well crack it with this Celtic team and their brand of swashbuckling, exciting, attacking football. A win in Dortmund against the hosts would be the biggest European scalp of Rodgers' European reign with Celtic to date. It's the one result that's missing from his Celtic CV. It is not beyond the realms of possibility either.

This is why Rodgers came back to Celtic in the first place to experience nights like Tuesday. It is what gets his juices and passions flowing as a manager.  Rodgers can't wait. The players can't wait. The supporters can't wait. Rodgers said: "We're going to play a top team in their own home patch. I am really excited to see how we play against it. They're a very good side who have got really good players. For us, we can go there and impose our style on the game. I

"In every game, we play and as long as we try and we press and we attack and fight, let's see where it takes us. I think we have shown throughout pre-season that we can manage the ball, and we can play. We have the attributes in the team that can help us now. Everyone is on the same page. Everyone is focused. Everyone is playing a high level of football, scoring goals and being really strong defensively. 

"So when I look at the team, I'm really proud of them and I know that there are lots of improvements still to make."

The stage is all set for Celtic. Whatever happens on the pitch will also be box office. If Rodgers and his men can pull off what would be an incredible Champions League league phase away victory for Celtic against Borussia Dortmund it would rank as one of the best results in their illustrious European history. If that happens the Irishman would be prouder still.

It would be: "Not bad for a team that doesn't play good football."