England head into their Super Eights clash with Sri Lanka here Wednesday knowing defeat could all but end their

chances of reaching the World Cup semifinals.

Michael Vaughan's men, handicapped by a six-wicket loss to fellow Group C qualifiers New Zealand during their opening match, which meant they didn't carry forward two points to the second round, face a make or break week.

England, after playing Sri Lanka, return to the Sir Vivian Richards Stadium on Sunday to take on reigning champions Australia, who've won five out of five at this World Cup.

Although it's mathematically possible for England to lose both games and still reach the semifinals, realistically they need to win at least one of their two matches this week to have a hope of reaching the last fourforthefirst time since 1992.

The omens against Sri Lanka are not good.

Last year Mahela Jayawardene's team beat England 5-0 in a one-day series, culminating in an extraordinary eight-wicket

triumph at Headingley.

Set 322 to win, Sri Lanka made 324 for two after a world record opening stand of 286 between Upul Tharanga (109) and Sanath Jayasuriya (152).

Since that match in July, England have tinkered with their side to such an extent that top-order batsman Ian Bell is likely to be the only survivor come Wednesday although Andrew Strauss, captain that day, could come in for fellow opener Ed Joyce.

Whoever England field as a first-wicket partnership, they don't have a pair to match the rapid scoring of the Sri Lankan duo and no-one near the class of experienced left-hander Jayasuriya, who made 115 in Sunday's 113-run thrashing of hosts West Indies.

However, England coach Duncan Fletcher said there was no point trying to make the likes of Vaughan and Joyce play someone else'sgame.

"We mustn't ask players to do things that are foreign to them, because that could really be pretty disastrous. All our players must play to their strengths," he said.

England, who gave themselves and the rest of the cricket world a confidence boost with their 2-0 win against Australia in the finals of the CB series, have seen their standards slip in a series of lacklustre wins against minnows Canada,

Kenya and Ireland.

The top three have repeatedly failed to come good while, in the field, England have only twice bowled sides out and even then made hard work of taking 10 wickets against Kenya and Ireland

"We've had a good chat about intensity and we need to have our fingers on the pulse this week," star batsman Kevin Pietersen said.

"The other day against Ireland we got six wickets and then the last few batters scored a load of runs. The intensity dropped off a bit, but that is natural.

"The boys have spoken about it and we know we have to keep our intensity up throughout."

By contrast, Sri Lanka look to have a far more balanced team with left-armer Chaminda Vaas and the unorthodox Lasith Malinga, whose four wickets in four balls almost setup a stunning win against South Africa, a handful for any batting side long before off-spin maestro Muttiah Muralidaran comes on.

"One of the great things about our side is that we have a variety and balance," said Sri Lanka wicketkeeper Kumar Sangakkara. "We've got three different types of fast bowlers, fourdifferent kinds of spinners and then when it comes to the batters we have variety there as well.

"Sanath at the top, workers in the middle and then guys who can finish off with a bang at the end."

And Sri Lanka coach Tom Moody, long touted as a contender to replace Fletcher in the England job, added: "We are very excited about the game, we've done well against them recently.

"We'll feel it's a game that we can win," said the former Australia international. "And that's the frame of mind we need to have."

SQUAD

ENGLAND (probable): Ed Joyce, Michael Vaughan (captain), Ian Bell, Kevin Pietersen, Paul Collingwood, Andrew Flintoff, Paul Nixon (wk), Ravi Bopara, Sajid Mahmood, James Anderson, Monty Panesar.

SRI LANKA (probable): Upul Tharanga, Sanath Jayasuriya, Kumar Sangakkara (wk), Mahela Jayawardene (captain), Chamara Silva, Tillakaratne Dilshan, Russel Arnold, Dilhara Fernando, Chaminda Vaas, Lasith Malinga, Muttiah Muralidaran.

Umpires: Asad Rauf and Billy Bowden.