George North has failed to impress for Wales during the Six Nations
North scored a try in the opening-round win over Italy despite suffering a dead leg, but he has made a minimal impact in back-to-back defeats to England and Scotland.
The Northampton Saints flyer has struggled to get his hands on the ball and a defensive mistake at Murrayfield allowed Tim Visser to cross for Scotland's winning score.
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North's indifferent form has called into question whether he deserves a place on this summer's British Lions tour to New Zealand but the 24-year-old has been backed to respond after some stern words from the Welsh management.
"I thought George had a very good game against Italy in very, very difficult circumstances," said Wales defence coach Shaun Edwards.
"He had a nasty bang to his leg but he toughed it out well. He wasn't at his best against Scotland but I think great players who have done great things for you in the past sometimes deserve a warning. If he is selected, then I expect George to be on his mettle."
North's defensive lapse against Scotland was one of a handful of mistakes which contributed to defeat in Edinburgh. Edwards, a stickler for keeping the opposition out, wasn't happy with what he saw from certain players.
He said: "They were individual mistakes because they [Wales players] didn't do what they practised in the build-up to the game.
"They decided to do what they wanted and not what the rest of their team-mates expected them to do."