Kewell has recovered from a groin injury and is back in full training
Prime Minister David Cameron will fly the flag of St George above his residence at 10 Downing Street in support of England's World Cup campaign.
Normally, the Union Jack, which represents all of the United Kingdom, is flown over Downing Street.
But with Scotland, Wales and Northern Ireland failing to qualify for the tournament, Cameron allowed the flag to be changed.
He said: "I'm sure that everyone in this house, no matter what part of the United Kingdom they come from, will be cheering 'Come on England!"
Franz Beckenbauer said he expects Germany's young team to reach the World Cup semi finals, despite the loss of captain Michael Ballack to injury.
"I am positive, the Germans are among the favourites," said Beckenbauer, who won the World Cup as German captain in 1974 and as coach in 1990.
"With a bit of luck I expect them in the semi finals.
"Ballack was the leader, captain, the head of the team and Germany will be missing him.
"But the team is very balanced and it doesn't have to be a disadvantage. If they go on as they have so far, they don't need a big star."
A World Cup photographer was held at gunpoint on Wednesday during a burglary at a lodge used by journalists covering Portugal and Spain.
Antonio Simoes was woken up by two burglars who held him while they took his camera, cash and credit cards.
"It was just two minutes but it felt like two hours. It was the scariest thing that has ever happened to me," said Simoes.
The thieves also stole laptops, mobile phones and cash from other rooms in the lodge in Magaliesburg town, north of Johannesburg.
Harry Kewell eased fears over his groin injury by joining in an intense two-hour training session with the Australian team on Tuesday night.
However, Everton midfielder Tim Cahill only took part in light shooting practice as he continued to struggle with a neck injury suffered during the 3-1 defeat by the United States on Saturday.
Defender Brett Emerton also joined in full training after overcoming his recent calf problem.
Torres found the net seven minutes after coming on as a sub
Spain striker Fernando Torres is confident he has fully recovered from a knee injury after making a scoring return in Spain's 6-0 win over Poland in their final World Cup warm-up match.
"The injury has passed and now I'm able to help my team-mates, so it's time to enjoy it," said Torres, who missed the end of the season with Liverpool after surgery in April.
"I'm sure there will be a lot of optimism and euphoria after the Poland game but we know it will be difficult."
United States defender Jay DeMerit says he will not try to "wind up" England striker Wayne Rooney when he faces the Manchester United man on Saturday.
Rooney's temperament was questioned following an outburst against the referee in England's 3-0 friendly win over Platinum Stars on Monday.
The forward was sent off against Portugal at the 2006 World Cup in Germany but Demerit insisted: "My worry as an individual is not to try and wind him up and try to get him sent off.
"That is the referee's job and that is Rooney's job as far as keeping himself under control. I don't think it is as easy as people think it is to wind him up."
Meanwhile, United States striker Jozy Altidore (ankle) and defender Oguchi Onyewu (knee), have both returned to training and will be fit to face England.
Serbia defender Nemanja Vidic is anxious not to get distracted by the prospect of a potential clash against England at the World Cup.
The Manchester United defender could come up against club team-mate Wayne Rooney in the last 16 of the competition if Serbia can progress from Group D.
"If we got to the second round I would like to miss England. England are the strongest team we could play, so I would prefer to avoid them," said Vidic.
"But it is best to focus on the first game because success at the World Cup for Serbia would be to reach the second round."
Mexico striker Carlos Vela says playing at altitude will not affect his side's performance against South Africa in the opening game of the World Cup on Friday.
"We are used to higher places, so we don't need much time to adapt to these conditions here, so that's not an excuse for us," said Vela, who plays his club football for Arsenal.
"Of course we will have all the fans and people against us in the first match, but that's nothing new to us."
Serbia have been given permission by football's governing body Fifa to switch training grounds after players complained the uneven pitch at the AW Muller Stadium could cause injuries.
Serbia will move to the nearby rugby ground from Thursday.
Greece centre-back Vangelis Moras will miss his team's opening World Cup match against South Korea as he recovers from a lingering groin injury.
Moras, who plays for Italian side Bologna, hopes to be fully fit for Greece's second Group B match against Nigeria.
Chile beat New Zealand 2-0 in a World Cup warm-up match on Wednesday, with the goals coming from Gonzalo Fierro and Estedan Parades.
Ghana has moved its World Cup base from the Roode Vallei Hotel in Pretoria to Sun City in Rustenburg because of "unresolved technical issues".
The Ghanaian Football association has provided no further details as to the precise reasons for the switch.
In addition, Serbia have been given permission by FIFA to switch training grounds after players complained the pitch at AW Muller Stadium in Johannesburg could cause injuries. The team is to move to the nearby rugby union ground.
Switzerland captain and striker Alexander Frei has travelled with the rest of the squad to South Africa despite suffering an ankle injury in training on Wednesday.
Team doctor Cuno Wetzel said Frei had sprained the ankle but initial fears he may have torn a ligament or broken a bone proved unfounded.
Nassim Ben Khalifa of Grasshopper Zurich has been put on standby in case the injury later rules Frei out of the tournament.
Switzerland begin their campaign against Spain in Group H on 16 June before then facing Chile and Honduras.
President of the United States soccer federation Sunil Gulati believes his country deserve more respect for the advances they have made in the game.
"I think we do get a lot of respect in many places in the world but there are still people in the United States who ask 'When do you think soccer will take off?" and there are still articles across the Atlantic that say MLS is a good pub league or whatever," he said.
"In the end I let the facts speak for themselves. We have a league that is 15 years old, there aren't many leagues in the world that have developed so quickly.
"I don't know what else we have to do? I guess part of what else we have to do would be to win on Saturday."
The US face England in their Group C opener on Saturday.
Colombian pop star Shakira has called for the legacy of the World Cup in South Africa to be education for all.
The Grammy-award winning singer-songwriter, who will join other music stars including Black Eyed Peas and Alicia Keys to perform at a concert on Thursday, visited Isu'lihle Primary School in Soweto on Wednesday and taught the children dance moves to the official World Cup song.
"It's [the World Cup] a great opportunity to bring all the attention to issues as important as education," said Shakira, who is a goodwill ambassador for the United Nations childrens' organisation UNICEF.
"Seventy-two million kids around the world [are] not able to attend school, of which 32 million are African. So this is our chance to make this World Cup's lasting legacy education for all."
Updated throughout the day.