The motto is everywhere you look at Slovenia's training camp - "Never Judge Greatness By Size" - and England will do well to heed the warning on Wednesday.
To qualify for the FIFA World Cup™, the team from a nation of just two million people knocked out Russia in a play-off and were eight minutes away from beating the United States in their second Group C match. If they had held on, Slovenia would have been safely through to the knockout stages before their meeting with Fabio Capello's men in Port Elizabeth.
Slovenia captain Robert Koren is confident his side can dent the egos of England's Premier League stars and is a firm believer in the slogan, written in English, which dominates their base in the wealthy Hyde Park area of Johannesburg.
"It was a big achievement for the country to come to the World Cup but now everybody wants to improve," he said.
"When we arrived in South Africa we said we wanted to go through the group stage and we are full of confidence that we can. We already expected before the tournament to go through the group stage, and this is still the same.
"We all know that England is a really good team with big players in their squad, but we are not thinking too much about England - we will concentrate on ourselves and the way we want to play," he said.
"In the England - USA game, England played okay, we saw some good things and bad things, and it was the same in the second game against Algeria. England didn't show the football we expected, but we all need to know that England will be ready."
Slovenia coach Matjaz Kek traded some information with England boss Fabio Capello when, after learning that Matthew Upson was set to start in place of the suspended Jamie Carragher, he revealed that Marko Suler's rib injury was likely to rule him out with Matej Mavric expected to come in.
Nejc Pecnik, one of the heroes of the play-off success against Russia, is out for three months with an ankle problem but otherwise Kek's side are at full strength.
That means Koren and talented playmaker Valter Birsa should play and could cause problems for England, so much so that Kek is confident he does not need to pay attention to the other Group C match between USA and Algeria.
While the public mood in England appears to be shifting away from Capello, Kek gets the sense that back in Ljubljana his country is united in excitement.
"Our whole nation is together, they are following our successes," he said. "They are together like the team is together at the moment."