Nigeria sweat on Gambo's fitness ahead of CHAN
The striker is battling a hamstring injury which kept him out of the Charity Cup clash against Enyimba last week and did not feature for this week's friendly against Niger Tornadoes in Abuja.
The striker was not involved in training on Friday with the rest of the team as he was left to work aside with the physiotherapists.
The striker could miss a big chance to stake a claim in Nigeria's World Cup squad after featuring for the Super Eagles at the FIFA Confederations Cup.
Nigeria have been drawn in Group A of the CHAN alongside hosts South Africa, Mali and Mozambique.