Ballack was left out of Chelsea´s squad for the group stages after the club insisted that an ankle injury would prevent him from being fit.
Low, preparing Germany for their Group D, Euro 2008 qualifier against Wales, said: "I discussed it with Michael and he could not fully explain Chelsea´s decision to me. Chelsea´s doctors estimate he will not be able to play for two to three more months, but Michael is much more optimistic and expects to play sooner. For us, Chelsea´s decision isn´t justifiable."
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