Striker Wayne Rooney gave England a huge boost on Tuesday when he began to work out with the rest of the squad.
Rooney, who broke his foot on April 29, took part in the first 20 minutes of the session at their training base near Baden Baden, to the delight of coach Sven-Goran Eriksson.
The 20-year-old Manchester United forward then did a mixture of running, sprinting and ball work on his own with England fitness coach Ivan Carminati. Rooney jet back to Manchester to have a scan on his foot on Wednesday.
"I think he looks very good," Eriksson told a news conference as his team prepare for Saturday's Group B opener against Paraguay. They also face Trinidad and Tobago and Sweden in the group.
Eriksson, who has until 24 hours before that game to keep Rooney or replace him with standby Jermain Defoe, said he expected the scan result by Thursday morning at the latest.
"It's totally up to the surgeons, the specialists, the doctors and physios. I can't judge it," he said.
"But I've always said I think he will be available, that he will take part in the World Cup. And I still believe it very, very strongly."
Goalkeeper Paul Robinson was also buoyed by Rooney's presence, saying: "He did the warmup today - he's been training with the physios for the last couple of days.
"Looking at him now, it's looking positive. It's gives us a boost obviously."