"Defoe goes with us to Germany because we have to be insured about Wayne Rooney," Eriksson said.
However, the Swede is defiantly optimistic Rooney can recover in time from a double fracture suffered against Chelsea on April 29 to play some part in the finals.
"Obviously, everybody thinks he will come back from Manchester on Wednesday evening and that's what I think," Eriksson said. "I have no doubts about it -- but I can't be sure, of course, until the scan is done."
Under FIFA rules, Eriksson has until 24 hours before their opening Group B game against Paraguay to replace Rooney in his squad, should the 20-year-old be ruled out of the finals.
Eriksson saw several reasons to be upbeat about England's chances in Germany, having steered them to only quarter-final places at the 2002 World Cup and Euro 2004.
"Today, everything is more or less perfect," said the Swede.
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"Fitness-wise we are much better, football-wise we are much better. So I think we are ready for the World Cup ... and I think we can be better and better with every game.
"We haven't reached our pitch in this moment but we will."
After Paraguay, England's Group B campaign continues against Trinidad & Tobago and Sweden.