Skysports.com understands Nottingham Forest and Sheff Utd have made bids for Rob Earnshaw.
Derby revealed over the weekend that they had accepted a bid for Earnshaw from a mystery club, believed to be Forest.
Now Sheffield United are believed to have joined the chase for the Welsh international and Derby are thought to be exploring the option of doing a swap deal with the Yorkshire club for Earnshaw
Earnshaw endured a disappointing time at Derby after arriving from Norwich last summer and Rams boss Paul Jewell is willing to let him move on.
The 27-year-old scored just one Premier League goal in 24 appearances in Derby's doomed campaign, but that has not put off Forest and Sheffield United.
Both clubs are believed to have had their bids accepted by Derby and they will now battle it out to sign Earnshaw.