England boss Fabio Capello believes his side can improve by 20% on their efforts in his first game in charge.
Capello will be at Wembley on Sunday watching England players
The Italian was satisfied with his players' attitudes in the 2-1 win over Switzerland, but said England need an extra edge to become world-beaters.
"Against Switzerland what I asked over three days in terms of movement and schemes was performed at 80%," he said.
"The England players will have to do what I ask of them. But I've found the players well-disposed and eager."
The former Roma, AC Milan and Real Madrid manager - who began his reign as England boss with the win at Wembley earlier this month - has a reputation as a strict disciplinarian.
And the 61-year-old is committed to applying the same principles which have brought him unparalleled success throughout his managerial career with England
When asked about his approach to turn his team into world-beaters, Capello said: "Disciplined on the pitch, with good movement as a team, and at the same time capable of stressing the qualities and abilities of each individual player.
"Every coach has his own ideas and characteristics. English players are tactically fine, they know how to move tactically.
"I had seen most of them in action before, but watching them on TV doesn't allow you to appraise them off the ball.
"You can only verify their tactical level from the pitch. But in England there are club sides of very high tactical levels."
Capello will be at Wembley on Sunday to assess the form of Chelsea's John Terry and Frank Lampard, if they are selected, along with Tottenham's Ledley King, in the Carling Cup final.
And although he said his English was progressing well, Capello admits he has been stumped by various regional accents.
"It is fundamental to speak the language, particularly before kick-off and during the interval, for tactical plans and psychological support," said Capello.
"The only difficulty, when I tour Premier League matches, is that different people in different accents talk to me, and in some instances I can hardly understand a word!"