Former dual-code international Jonathan Davies warns that Wales cannot take beating Fiji for granted.
Warren Gatland's side beat Group A rivals England at Twickenham on Saturday to take a step closer to the quarter-finals.
But Davies told Scrum V that famous win will have been wasted if Wales slip up in their next game against Fiji in Cardiff on Thursday.
Fiji have knocked Wales out of a World Cup before, at the 2007 tournament in France.
Watch all the analysis on Scrum V Rugby World Cup Special on Sundays, BBC Two Wales; available on iPlayer for seven days after transmission.