Doctor Steve Peters can hand England a vital mental edge at the World Cup, according to Harry Redknapp.
Psychologist Peters, who has worked with snooker player Ronnie O'Sullivan and was involved at Liverpool as they claimed an impressive second-place finish in the Barclays Premier League, joined Roy Hodgson's England backroom set-up in March.
QPR boss Redknapp admitted he only employed a sports psychologist for the first time this season - Jonny Wilkinson's mentor and former Newcastle United coach Steve Black.
Redknapp said former nightclub bouncer Black was pivotal to QPR's promotion via the play-offs, and backed Peters to have a similar effect with England.
"For the first time this year we brought a guy into QPR and he's been fantastic," said Redknapp.
"Steve Black came in and did a great job for us, motivating players and spending time with them one-on-one as well.
"He's worked with Jonny Wilkinson for more than 10 years, he's got Danny Cipriani's career back on track, and he's amazing.
"I think Steve Peters' presence will be important for England, he has worked with Liverpool this year.
"Steven Gerrard has belief in him, he wants him on board so I think he will definitely have a positive impact."
Redknapp recruited Black on Joey Barton's recommendation, admitting he will seek to employ the master motivator again next season.
The former Tottenham boss said Black's words helped QPR edge over the line in their tense 1-0 Championship play-off final victory over Derby.
"He works with Joey Barton to be fair, I was talking to Joey one day, and he was saying about the fantastic work this guy does with him, because Joey's had a great season," said Redknapp.
"And so I decided to meet him.
"He came down to Middlesbrough, had a chat with him and we brought him on board.
"He did a great job for us and I'd love to have him back on board next year.
"I think he's a great motivator, he inspires confidence and belief in people, you spend time with him, and in meetings there are lots of positive words on the walls.
"He'll talk to everyone about being together as a group, what we have to do, work for each other.
"He certainly got me motivated listening to him, he makes you feel like you couldn't get beaten almost.
"Maybe he was right, because in that play-off final we came back and found a way.
"That was always what he said: 'find a way, find a way', and God knows how, but we did."
Self-confessed eternal optimist Redknapp believes England can win the World Cup in Brazil, that starts with a testing clash against Italy on June 14.
Redknapp backed manager Roy Hodgson's stance urging the England players to belt out God Save the Queen this summer.
The former Portsmouth and West Ham boss backed Gary Cahill to forge a resolute defensive partnership with Phil Jagielka.
"I thought we could have won it in South Africa four years ago, even though that shows what an optimist I am," said Redknapp, launching 666BET.com's special odds of 1966/1 for England to win the World Cup for a limited time.
"Brazil are favourites and Argentina are a real threat too, but I don't see why England can't win it with a bit of luck.
"I love to see us sing the national anthem, we're a very patriotic nation.
"I'm all for them belting it out.
"It's brilliant to see them stick their chest out and sing, I'm sure Steven Gerrard will be leading the team in that.
"I found myself even at Wembley last week signing the anthem before the game, I always sing it, it's part of our tradition to do that, so I'd like to see the players do it.
"I'm a big John Terry fan so he would have been in the team for me had he not retired, but Cahill has improved out of all recognition, and playing alongside John has certainly helped.
"It's improved him as a player and a leader.
"Jagielka never lets you down, so it's solid at the back and a good squad."