He will next appear at the Old Bailey on March 16.
The 39 victims, who included two 15-year-old boys, were found on an industrial estate in Grays in Essex, about 32km east of London in October.
The bodies of 31 men and eight women - all from Vietnam - were found inside the truck container on October 23 at the Waterglade Industrial Park in Grays, a town about 25 miles east of London.
Postmortem examinations have been completed and the provisional cause of death has been given as a combination of hypoxia and hyperthermia in an enclosed space, Essex police said. Essex police also report having made two more arrests in connection with the case.
Brought right into United Kingdom on European Arrest Warrant and is now in Essex Police protection.
Last week, on the instruction of Essex Police, German authorities and the National Crime Agency carried out an arrest.
Police have said the Vietnamese victims were found not long after the container arrived in Britain from Zeebrugge in Belgium.
Lorry motorist Maurice "Mo" Robinson, 25, of Craigavon, Northern Ireland was formerly with 39 matters of homicide and has actually confessed helping illegal migration and obtaining criminal residential or commercial property.
He faces 39 counts of manslaughter and one count of conspiracy to assist unlawful immigration.
Meanwhile, previously arrested Eamonn Harrison, 23, from Northern Ireland is still awaiting extradition to the United Kingdom from Ireland, and faces 39 charges of manslaughter and charges for conspiracy to traffic people and conspiracy to assist unlawful immigration. He has not yet entered pleas to the manslaughter counts or conspiracy to commit human trafficking and transferring criminal property.
He is due to appear before the same court again on Wednesday.
Christopher Kennedy, 23, of County Armagh, has actually begged blameless to conspiracy theory to dedicate human trafficking and helping illegal migration and results from take place test following year.
Police think trucks were utilized to unlawfully smuggle individuals right into the United Kingdom using the port.