Derby County manager Nigel Clough says Kris Commons's contract demands are the reason why the striker has not yet signed a new deal at Pride Park.
The 27-year-old's current contract runs out at the end of the season and he has said he wants to stay.
But Clough told BBC Radio Derby: "We're doing everything we can to keep Kris.
"There is only one sticking point in contract negotiations and that's money. It's purely what we can afford and what his ambitions are."
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