Reds boss Simon Davey had told BBC Radio Sheffield of his frustration after Muller's clearance hadn't come through before Saturday's season opener with Coventry City:
"It was disappointing that he couldn't play on Saturday as all the paperwork was done.
"But we had to wait a few days for his clearance to come through."
Meanwhile, Derby have allowed on loan defender Lewin Nyatanga to play in tonight's Carling Cup match with Darlington.
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