Scotland manager Gordon Strachan believes that his side are more than capable of causing "problems" for Wales.
The Scottish outfit come up against their rivals tomorrow in a World Cup qualifier at Hampden Park following October's last meeting, which ended 2-1 to Wales.
"We've been working on our system all week at training," Strachan said in a press conference. "It's up to the players now to do what they are good at. Every team has strengths and weaknesses and the players are aware of dangers in Welsh team.
"I've enjoyed the challenge of picking the 11 that are suitable for the game tomorrow. If we play to our potential then I'm expecting us to cause them problems."
Meanwhile, Wales star Gareth Bale travelled to Scotland separately from his teammates and has missed every training session this week.
