Frank Lampard thinks England's versatility will be extremely useful during their World Cup campaign.
Coach Sven-Goran Eriksson experimented tactically during Tuesday's international win against Hungary, using Steven Gerrard as a replacement for injured striker Wayne Rooney and Jamie Carragher in an unfamiliar midfield role.
There is concern that Eriksson does not know his best side just a week before the start of the tournament but Lampard insisted: "I think it worked on Tuesday. You can't go into the World Cup unless you try out options not only in training but in games.
"We've played with a flat 4-4-2 and with a holding player. I think the public, the fans would want to see those different options, I don't think you can criticise.
"Hopefully we will use the right ones and perform well when it matters. There are different systems for different games.
"People are trying to say that all of a sudden we've changed our system a week or two before the World Cup. I don't think we have. We're experimenting with a couple of options that we've got.
"You'd be a fool to not do that because you know at times you'll have to play in a different way."
England play Jamaica in their final World Cup warm-up game on Saturday before opening their Group B campaign against Paraguay on June 10.