Birmingham midfielder Charlee Adams has signed a new one-year contract with the club.
Southampton are confident Jay Rodriguez will commit to a new long-term deal but the player will consider his options.
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.