England midfielder Steven Gerrard will not train with the squad today due to the back problem that forced him out of Tuesday's session.
Gerrard's back problem is not thought to be too serious
The 26-year-old has a stiff back, but it is thought he will be fit for Saturday's opener against Paraguay.
Eriksson said: "He has a stiff back but it shouldn't be a problem.
"Everything is, so far, absolutely perfect, there are no big problems and I can't see any problems for Saturday - fingers crossed."
David Beckham, Ashley Cole, John Terry and Gary Neville will continue in full training after making their return from niggling injuries on Tuesday.
Beckham took part in the squad's first training session on German soil after missing Monday's session after picking up an ankle injury in the 6-0 friendly win over Jamaica on Saturday.
He broke away from the main group to do some light jogging with Cole and England physio Gary Lewin.
Terry and Neville both took a full part in training at Buhlertal, near their base in Baden-Baden.
There was a brief scare when Terry went down hard after a challenge from Chelsea team-mate Wayne Bridge.
When he got back to his feet he appeared to be limping but the big defender soon recovered and was able to continue without any effects.
Apart from Gerrard and Wayne Rooney, who is back in England to undergo a scan on his broken foot, Eriksson expects the full squad to take a full part in training on Wednesday.
Neville missed the Jamaica game with a hamstring injury, while Terry, Beckham and Cole were all substituted.
"I'm happy with it. I think it's settled down," said Neville. "I'd have liked to have taken part in the Jamaica game but it wasn't to be. Hopefully I can train this week and be ready for Saturday."
The Manchester United defender told BBC Sport that he is determined to make Germany 2006 count as one of the highlights of his career.
"I want all the 80 caps I have amassed to count for something. Otherwise I will look back at it as an appearance level rather than a time when I have won something. That is not what my career and my upbringing at Manchester United has been all about.
"I suppose some talk about my last chance scenario, it could be my last tournament, but I say that to myself in every tournament. I have been brought up at United to think that all big games can be your last chance."
England goalkeeper Paul Robinson also sees the tournament as a defining moment, both professionally and personally.
He said: "This is a proud moment for me as a football and as a person. Every time I pull on an England shirt it fills me with a lot of pride.
"I see this as a natural progression in my career. I have played in friendlies and World Cup qualifiers. Now it is the World Cup and this is now the next stage in my development as a player and a person.
"I am very excited. I am anticipating an excellent tournament. I can't wait to get started. There is a buzz about the squad. We know the quality of the players and what we don't want to do is under-achieve and we have got to make it our business not to do that."