Raiders halfback George Williams also says the next step for the Green Machine's attack is unlocking the defences of the top NRL teams.

The Raiders currently sit fifth on the NRL ladder, but with two rounds to go they can still slip into the top four if either the fourth-placed Parramatta Eels or the Sydney Roosters (third) slip up.

They face the New Zealand Warriors at Canberra Stadium on Sunday before travelling to Kogarah to take on Cronulla in the final round.

Win both and fifth is the lowest they can finish, although they could go as high as third.

No one has won it from the bottom half of the top eight since the Bulldogs did it from sixth in 1995.

But Williams said the Raiders backed themselves to do it too.

Last year the Raiders finished fourth before going on to the grand final.

"Of course we've got the belief. Ideally we want to finish fourth," Williams said on Thursday.

"The boys talked about they did it last year and the benefit of them winning the first week and having that week off.

"[In a] perfect picture that's where we want to be, but if not we'll go all the way if we have to."

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There's the feeling the Raiders have been building towards the finals, having won seven of their past nine games.

Their attack stuttered earlier in the season, but they've scored more than 30 points in four of their past five games.

The Raiders' one blemish was their 18-6 loss to the Sydney Roosters, where Williams was critical of their second half having been right in the game in the opening 40 minutes.

A big part of that potency has been the form of Jack Wighton, who has scored six tries in the past four games.

It's taken him to 10 for the season and the Raiders' equal-top try scorer with Nick Cotric - and equal 12^th in the NRL.

Williams felt the final key to their attack was for himself and fellow half Wighton to start unlocking the defences of the top teams - like the Roosters and Penrith.

The England international was excited about his first NRL finals campaign being just around the corner having won two Super League premierships with Wigan.

"One hundred per cent. We've been pretty pleased with our attack the last few weeks, apart from the Roosters game where we scored one try off a kick off [John Bateman]," he said.

"We're not dwelling too much on that game.

"Our attack's been pretty good going forward. Jackie's scoring a good amount of tries now and is up near the top there. We just keep on building."

NRL ROUND 19

Sunday: Canberra Raiders v New Zealand Warriors at Canberra Stadium, 2pm.

Raiders squad: 1. Charnze Nicoll-Klokstad, 2. Semi Valemei, 3. Jarrod Croker (c), 4. Jordan Rapana, 5. Nick Cotric, 6. Jack Wighton, 7. George Williams, 8. Josh Papalii, 9. Siliva Havili, 10. Dunamis Lui, 11. John Bateman, 12. Elliott Whitehead, 13. Joe Tapine. Interchange: 14. Tom Starling, 15. Ryan Sutton, 16. Hudson Young, 17. Corey Harawira-Naera. Reserves: 18. Sam Williams, 19. Matt Frawley, 20. Matt Timoko, 21. Sia Soliola.

Warriors squad: 1. Roger Tuivasa-Sheck (c), 2. Adam Pompey, 3. Adam Keighran, 4. Peta Hiku, 5. Hayze Perham, 6. Kodi Nikorima, 7. Chanel Harris-Tavita, 8. Lachlan Burr, 9. Karl Lawton, 10. Isaiah Papali'i, 11. Jack Murchie, 12. Tohu Harris, 13. Jazz Tevaga. Interchange: 14. Wayde Egan, 15. Adam Blair, 16. Eliesa Katoa, 17. Tom Ale. Reserves: 18. Josh Curran, 20. Paul Turner, 21. Gerard Beale, 22. Rocco Berry.