Preview: Wales v Fiji
The Welsh skipper said that after their dramatic win over England, the team is determined not to talk themselves out of another victory.
The Welsh are second in the "Pool of Death" on points difference from Australia, the two sides having both notched up two victories in two matches.
England sit third having lost 25-28 to Wales and play the Wallabies at Twickenham on Saturday in a must-win match.
Warburton said the team had been buoyed by their outstanding win over England even though it came at an injury cost, Hallam Amos and Scott Williams ruled out and Liam Williams undergoing concussion protocols.
"The players are talking to each other and we definitely can't let this slip now against Fiji. I know the players aren't going to be in the wrong mindset going into the Fiji game because it would be so easy to slip up against Fiji, who I guarantee won't be 66-0 like it was four years ago.
"We know we're going to have to be at our best to get a good result, so there's going to be no complacency whatsoever," Warburton said.
Indeed, that rogue result in New Zealand four years ago aside, it was Fiji who produced one of the performances of the 2007 World Cup in France when they beat Wales 38-34 to send the Welsh home early.
"The performance against England sort of proved to ourselves we can compete and we've got a fantastic chance of doing well and we've always believed that but it's one thing believing it and another thing seeing it.
"Being able to go to England and win at Twickenham was a massive confidence booster for the whole squad," he added.
Wales coach Warren Gatland said he wanted his players to build a run of victories.
"The longer we are together the better we get and when we've won Grand Slams and stuff. The momentum of big performances carries us through and that's what I'm counting on for Thursday," Gatland said.
Fiji, who have lost Nemani Nadolo to a ban but welcome back Dominiko Waqaniburotu from his week on the sidelines, now have little left but an upset to hope for in the tournament's toughest pool.
In an arduous opening to the tournament, Fiji played and lost to England and Australia in just five days.
"It is tough," said assistant coach Tabai Matson who played for Fiji in the 1999 World Cup and later played 10 games for the All Blacks.
"But in saying that we are still enjoying ourselves and we have got a great opportunity in front of us. The mountain just got steeper. Now we are relying on other teams to fall over."
Fiji have lost two players – prop Isei Colati and wing Waisea Nayacalevu – through injury, but Matson said they have taken heart from the way Wales overcame a horror run of injuries to overpower England.
"It was a great Welsh team performance and we have to understand that 80 minutes of rugby is going to be the minimum amount of effort for us," he added.
A lack of discipline has marked Fiji's opening matches. They have conceded 24 penalties, three yellow cards and had two players cited. With Wales' flyhalf Dan Biggar in fine kicking form, booting 23 points in the England win, Matson said issues of ill-discipline had been addressed.
"Even for us now, our discipline has let us down and that – against the big teams – can lead to three, six or nine points, when you are a man down. Then you are chasing the game. So, it is a critical part of our success," Matson added.
Players to watch:
For Wales: The Morgans have been brought into the team and it will be interesting to see how they go on the big stage while George North will always be a threat on the wing. The loose trio of Taulupe Faletau, captain Sam Warburton and Dan Lydiate will be a handful while lock Alun Wyn Jones will look to continue his fine form. All eyes will certainly be on flyhalf Dan Biggar to see if he can live up to the hype after his superb performance against England.
For Fiji: Campese Ma'afu will provide the grunt up front while lock Leone Nakarawa was an absolute menace all over the park in their previous match. Captain Akapusi Qera will have his hands full to keep his side's discipline in check while there will be plenty of pressure on the young shoulders of flyhalf Ben Volavola to get the backline to fire. Wing Timoci Nagusa goes into the match with a big reputation and has massive shoes to fill with Nemani Nadolo suspended.
Head to head: The scrums will play a massive factor in the contest as both sides pack a punch while both side's loose trios will have to be on the top of their game, but all eyes will be on two individual match-ups – between locks Leone Nakarawa and Alun Wyn Jones as well as flyhalves Dan Biggar and Ben Volavola. Each player is in exceptional form and will go hammer and tongs at each other throughout their time on the park.
Previous results:
2014: Wales won 17-13, Cardiff
2011: Wales won 66-0, Hamilton (WC pool match)
2010: Wales and Fiji drew 16-all, Cardiff
2007: Fiji won 38-34, Nantes (WC pool match)
2005: Wales won 11-10, Cardiff
2002: Wales won 58-14, Cardiff
1995: Wales won 19-15, Cardiff
1994: Wales won 23-8, Suva
1986: Wales won 22-15, Suva
1985: Wales won 40-3, Cardiff
Prediction: Fiji will be up to the challenge to have some influence on who progresses from the "Pool of Death" and will certainly push Wales to their limits. However, Wales will have too much momentum and confidence from their win over England. Throw in a boisterous Cardiff crowd and Wales will take this one by about 10 points.
Teams:
Wales: 15 Matthew Morgan, 14 Alex Cuthbert, 13 Tyler Morgan, 12 Jamie Roberts, 11 George North, 10 Dan Biggar, 9 Gareth Davies, 8 Taulupe Faletau, 7 Sam Warburton (captain), 6 Dan Lydiate, 5 Alun Wyn Jones, 4 Bradley Davies, 3 Tomas Francis, 2 Scott Baldwin, 1 Gethin Jenkins
Replacements: 16 Ken Owens, 17 Aaron Jarvis, 18 Samson Lee, 19 Luke Charteris, 20 Justin Tipuric, 21 Lloyd Williams, 22 Rhys Priestland, 23 James Hook.
Fiji: 15 Metuisela Talebula, 14 Timoci Nagusa, 13 Vereniki Goneva, 12 Lepani Botia, 11 Aseli Tikoirotuma, 10 Ben Volavola, 9 Nemia Kenatale, 8 Netani Talei, 7 Akapusi Qera (Captain), 6 Dominiko Waqaniburotu, 5 Leone Nakarawa, 4 Tevita Cavubati, 3 Manasa Saulo, 2 Sunia Koto, 1 Campese Ma'afu.
Replacements: 16 Viliame Veikoso, 17 Peni Ravia, 18 Leeroy Atalifo, 19 Nemia Soqeta, 20 Malakai Ravulo, 21 Henry Seniloli, 22 Joshua Matavesi, 23 Kini Murimurivalu.
Date: Thursday, October 1
Venue: Millennium Stadium, Cardiff
Kick-off: 16.45 (15.45 GMT; Friday October 2, 03.45 FJT)
Referee: John Lacey (Ireland)
Assistant referees: Jérôme Garcès (France), Mathieu Raynal (France)
TMO: George Ayoub (Australia)
AFP & @rugby365com