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Cameroon was only minutes away from a group-stage elimination after trailing Gambia but a James Gomez own goal and stoppage-time strike from Christopher Wooh sealed a 3-2 victory and a Round of 16 place.

It takes on Nigeria in Abidjan on Sunday (AEDT) but Song warned his backline to be more vigilant ahead of lining up against Nigeria's African footballer of the year and Napoli frontman Victor Osimhen.

“We have already conceded six goals and we will [have to] find the formula to not concede,” former Liverpool and West Ham United defender Song said.

“We will try to put Nigeria in difficulty and fight to continue.

“I know what needs to be done and we will do everything possible to obtain a positive result.”

Cameroon is expected to be boosted by the return of captain Vincent Aboubakar, who missed the entire group stage with a thigh injury.

Nigeria had a more straightforward passage into the knockout stages, following up a draw against Equatorial Guinea with wins over tournament host Cote d'Ivoire and minnow Guinea-Bissau.

It has only scored three goals in the campaign but boss Jose Peseiro is satisfied with the approach.

“I saw some statistics that said our team until now has created more clear opportunities than the other opponents,” Peseiro said.

“Sometimes the ketchup doesn’t come, but the next time all the ketchup (comes out). In the next match or another match, we can score more goals with less opportunities.”