Manager Craig Levein believes that if Scotland repeat their Hampden performance against Liechtenstein when the two sides meet again in Vaduz on Saturday night it will bring an abrupt end to their Euro 2012 hopes.
Levein's men needed a dramatic 97th-minute header from Stephen McManus to beat the Group I minnows 2-1 in a nervy qualifier at the national stadium in September last year. Scotland go into the return game in Liechtenstein in a precarious position, two points behind second-placed Czech Republic with both countries having two games left.
With Spain to come, the Scots need a win on Saturday to have a realistic chance of making the play-offs, but Levein said: "We don't really need any evidence to show that if we are not at our best then we won't be successful because the last time we played them we weren't at our best and we struggled to beat to beat them at home."
He added: "If we put in a performance like that this time, we won't beat them. I am not worried about the pundits and fans, how they view Liechtenstein doesn't have an effect on how we play. What I'm really concerned about is that we make sure that the players and I understand the nature of what we are facing."
The former Scotland defender continued: "I get the chance to see Liechtenstein regularly. They have taken four points off Lithuania, the same as we have, and were very unlucky recently against Switzerland.
"There is an understanding in their team which makes it very difficult to break them down. The good things for me is that we have a good group of players who don't take their foot off the gas.
"I can say that there hasn't been a game when I felt that we weren't 100% on it, and that's what we need to be, focused, and play the game with an intensity. If we don't move the ball quickly then we will struggle."
The Scotland squad flew out from Glasgow Airport for their Switzerland base without skipper Darren Fletcher, who is ruled out of the first match after being struck down with tonsillitis, although it is hoped that the Manchester United midfielder will have recovered for the game against Spain.
Striker Kenny Miller has a minor tear in his groin and is also likely to miss the Liechtenstein game but he travelled and is hopeful of being fit to face the Spanish.
Aston Villa defender Alan Hutton has recovered from a knee knock while Graham Dorrans and Barry Robson have shrugged off their respective ankle and thigh complaints.
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