The Rams administrators agreed to take a nine-point penalty from the EFL for Financial Fair Play offences, putting their total to -3 in the Championship.
Derby have also dropped their appeal against a 12-point hit for going into administration, leaving them with a total loss of 21, with two further three-point punishments still hanging over their heads.
The Sun says Rooney, 36, was taking training when the punishment was announced Wednesday, but is expected to tough it out.
Bidder Chris Kirchner is trying to complete a deal to takeover the Rams, while others have shown an interest.
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