Blackpool have signed Derby striker Kwame Thomas on a six-month loan.
Crawley have signed former Birmingham goalkeeper Callum Preston on a one-year contract.
Rob Hall has extended his loan stay with Birmingham by a further month.
The West Ham winger will now remain at St Andrew's until at least Saturday February 16, although his parent club do have the option of a recall clause.
Hall joined Blues in November and has been an instant hit with both manager Lee Clark and the club's fans.
The England Under-19 international has made a total of eight appearances to date.