Derby teenager Offrande Zanzala has signed a professional contract with the club.
Birmingham have signed Nottingham Forest midfielder Robert Tesche on loan.
St Mirren boss Danny Lennon is taking a look at Sporting Kansas City forward Dom Dwyer with a view to signing him on a short-term loan deal in January.
The 22-year-old Englishman will start training with the Buddies today.
Lennon said: "I became aware of Dom through an agent. Kansas City's season is over and there are one or two of the MLS players trying to get over (to Britain).
"It has been on the back burner for a month to six weeks but Dom is over now.
"It would only be a short term one for us so we will have to wait and see but the reports we have had on him are positive."