“I've always said I wasn't aware of the severity of Thom's injury until after the game”
Scotland have failed to score a try in their last four outings but Evans is confident that profligacy has been resolved by some focused training sessions.
He said: "It's been addressed, so let's hope we get it right against Wales.
"The main thing has been a real clear understanding. We know the pattern we're trying to play, guys know where they're supposed to be.
"We've been setting ourselves up in similar situations as we got ourselves in against England.
"We will get in those positions against Wales. It's knowing the right thing to do.
"Where we might not have gone the right way during the game, we've corrected that in case we're in a similar position against Wales."
Scotland are returning to the scene of one of their most devastating losses in recent times, not just in terms of the manner of defeat, but also in the injury toll, as they seek a first win in Cardiff in 10 years.
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