"I get the feeling the group is on the verge of some really big performances and this will be one of them," said the ex-Bradford Bulls coach.
"We have so far seen a Fiji team that is very exciting to watch with some brilliant outside backs. They have a set of forwards that are as physical as any team in the tournament. I can see why people see them as a threat on Saturday.
"We are looking to improve each week as the tournament moves towards the knockout stages.
"It is important to win against teams in and around you, but at some point you have to make sure all elements that have been positive in every game come together aiming for that complete performance.
"We know that if we are going to win the World Cup that has to happen."
England's 19-man squad v Fiji:
Carl Ablett (Leeds Rhinos), Tom Briscoe (Hull FC), George Burgess (South Sydney Rabbitohs), Sam Burgess (South Sydney Rabbitohs), Rob Burrow (Leeds Rhinos), Rangi Chase (Castleford Tigers), Leroy Cudjoe (Huddersfield Giants), Liam Farrell (Wigan Warriors), Brett Ferres (Huddersfield Giants), James Graham (Canterbury Bulldog), Ryan Hall (Leeds Rhinos), Chris Hill (Warrington Wolves), Michael McIlorum (Wigan Warriors), Lee Mossop (Wigan Warriors), Sean O'Loughlin (Wigan Warriors), Kevin Sinfield (captain) (Leeds Rhinos), Sam Tomkins (Wigan Warriors), Kallum Watkins (Leeds Rhinos), Ben Westwood (Warrington Wolves).
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