The 29-year-old joined the Rams on a non-contract basis in October and did enough on his debut against Sheffield Wednesday to earn a two-month deal.
The former Reading and Bristol City midfielder made just two further substitute appearances and will now look for a new club.
Derby first-team coach Paul Simpson told the club's official website: "He has been great to have around and in his only start he did a great job against Sheffield Wednesday.
"But we just felt we needed something else and a little bit more moving forwards."
- Sports & Recreation
- Sheffield Wednesday