Yusuf served as the Waqf Board chairman from March 1999 to March 2004 before he was made Power minister in the Sheila Dikshit government in 2005.
Khan alleged Waqf Board driver Mohammad Rafiq continued to serve Yusuf even after he became a minister and the Board bore all his expenses, including salary.
"By illegal and unlawful taking over of the employee of Delhi Waqf Board in his personal service, Haroon Yusuf converted a valuable resource of the Waqf Board into his own personal use thereby causing wrongful gain to himself and loss to the Board," Khan said in his complaint to the Delhi government's Vigilance directorate.
Yusuf rubbished the charges saying had had three drivers with him when he was a minister but he does not remember their exact details.
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He said, besides driving, the drivers also performed other duties such as carrying dispatches to different departments.
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The Delhi Waqf Board has also filed complaint with Vigilance directorate of Delhi government, against the then Board chairman Chaudhary Mateen Ahmad and other members.