Chelsea coach Luiz Felipe Scolari said: "Ballack is out for maybe two or three weeks. I am not angry - I am happy because what happened is a test for me that I am a good coach."
Ballack was sidelined earlier in the season because of a bruised foot he suffered on the first day of the new campaign against Portsmouth.
He had been a doubt for the game against Wales in Monchengladbach with what was said to be a calf injury - but now he is ruled out again after a double bout of surgery.
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