Captain John Terry believes tonight's showdown with European champions Spain will provide the sternest test yet to Fabio Capello's England revolution.
England travel to Seville with confidence and optimism high following a hugely impressive start to Capello's reign, which has seen the Three Lions go from Euro 2008 qualifying failures to one of the continent's most in-form sides.
However, tonight they come up against a team who are arguably a cut above any other national side on the planet.
Not only did Spain conquer Europe last summer and take over as FIFA's number one ranked team, but they are also on a remarkable 28-match unbeaten run, 26 of which have ended in victories.
It promises to be as tough a challenge as England have faced in years and Terry, for one, is under no illusion just how hard it could be at the Ramon Sanchez Pizjuan stadium.
When asked at yesterday's pre-match press conference if he thought it was England's biggest test to see how far they had come under Capello, the Chelsea centre-back said: "I think so. I think we're moving in the right direction with our recent performances and our recent results. We're playing very well, but this is a big test against one of the best sides in the world."