That's the prediction from former national team boss and winner of 77 caps, Alex McLeish
With the Welsh pointless after two games, and reeling from their 6-1 hammering by Serbia, Chris Coleman's team are one defeat away from exiting the World Cup qualifying race.
Scotland are two points better off after back-to-back draws against the Serbs and Macedonia, but now face trips to Wales and joint-table-topper, Belgium.
McLeish can boast the best win ratio of any Scotland boss, and knows precisely what is at stake for both Celtic countries when they clash in a month's time.
"Chris is obviously under a bit of pressure with that result on Tuesday," said McLeish.
"But the next game has got to have a massive sense of pride for both managers.
"Scotland will still feel they are in it (qualification), and Wales are not too far away because of draws on Tuesday.
"But, what a cup final that looks to be."
He believes Craig Levein needs a Joe Jordan, Ally McCoist or Mo Johnston to fire the nation back into contention and said: "It is a decent bunch of players, probably the best bunch for about 10 years.
"But it's just that little bit of inspiration we lack, the one person who can pop up with a goal.
"I'm harking back to my own days with Mo Johnston and McCoist, and go back further to Joe Jordan getting us through to the finals."
Many fans believe that man is there – Steven Fletcher. But the impasse between the £12million Sunderland striker and Levein is no closer to being resolved.
McLeish said: "Some boys in the squad will be fed up hearing about Steven, and will be determined to show they don't necessarily need him.
"But, I believe they do, and hopefully he will pick up the phone."
McLeish has sympathy for Levein, who is under intense pressure with calls for him to go.
But he counsels him to remain resolute and said: "It's horrible. When the fans start to have a little go at you, it is very uncomfortable.
"But Craig has been strong in his tactics and in his belief, and has got to remain strong because there are 24 points to be played for."