Derby's newest recruit George Thorne will undergo surgery after damaging the anterior cruciate ligament in his left knee.
Swindon have completed the signing of Josh Lelan on a youth loan from Championship outfit Derby County.
Derby County manager Steve McClaren has confirmed trialist Alassane Toure has made a good impression.
George Thorne may have stepped out of the Premier League, but believes he will soon be back there with Derby County.
New-signing George Thorne believes Derby can gain promotion to the Barclays Premier League after narrowly missing out in the Championship play-offs last season.
Chris Martin grabbed a hat-trick as Derby beat Notts County 3-1 in a pre-season friendly at Meadow Lane.
Derby have signed George Thorne on a permanent deal from West Brom.
Derby have completed the signing of former Atletico Madrid midfielder Ivan Calero on a two-year contract.