Aalborg stand-in boss Allan Kuhn dismissed the quality of Scottish football as he threatened to send Celtic crashing out of the Champions League.
The Hoops arrived in Denmark having won their last 11 SPL games in a row as they continue their quest for their fourth title in succession.
The Parkhead side's form away from home in the Champions League, however, is less impressive, having picked up only one out of a possible 51 points away from Glasgow in the group stages of the competition.
Kuhn had Celtic watched in their 3-1 win over St Mirren at Love Street on Saturday but he insists the formality of that victory failed to hide some fundamental defensive problems.
"St Mirren were the better team in the first half but Celtic were better in the second half,'' he said. "But it was a Scottish game and Celtic are nearly always the winner there, except when they meet Rangers.
"They have more national players but I don't think they are a better team than us. Celtic will always get results in Scotland but it will be a difficult match for them against us in the Champions League.
"We are at home and in the last five years we have lost two European matches here to Getafe and Manchester United. So we are a strong team at home in European competition. It is difficult to talk about weaknesses in a team but one thing I have noticed about Celtic is that they concede goals.
"It is not every game that they keep a clean sheet. So I'm sure we can score goals against them and that will be important because we have to win the match.''
Aalborg skipper Thomas Augustinussen, who stressed the Danish side had improved since the goalless draw in Glasgow on match day one, also pinpointed the Hoops' defence as their weak spot.
He said: "Celtic are strong but we are strong too and we are a better team now than we met them in the first game in Glasgow. The last time we were okay so I have a lot of confidence for this game.
"We are a better team, we are better organised with a better defence. I think we can get through them. We have worked a lot in the last month and we have been playing much better.
"We believe so much in ourselves now and believe that we can beat every team we meet. If we do our jobs, like we did against Villarreal here and when we played in Scotland, then we have a good chance.''