The 21-year old Zambian striker has signed a five-year deal with the Saints, for an undisclosed fee, but still needs to gain international clearance.
Nevertheless, manager Nigel Adkins is looking forward to seeing the former Maccabi Tel Aviv attacker in action.
"Emmanuel is a lightning-quick striker who I am sure will excite the fans," he told the club's official website.
"He is only 21 years old but already has a great deal of experience, notably so at international level.
"He will bring something different to the group that we already have here at Southampton, and I look forward to seeing him pull on our shirt for the first time."