Nigeria were held to a goalless draw by Sierra Leone in an Africa Cup of Nations qualifying fixture in Freetown on Tuesday.
The result at the National Stadium means the Super Eagles would have to wait for the other group games to go in their favour to confirm their place at Cameroon 2022.
However, they remain at the summit of Group L with eight points after four matches.
Following Friday’s 4-4 draw in Benin, coach Gernot Rohr made two changes to the starting XI as Leicester City’s Kelechi Iheanacho led the attack, in the absence of injured Victor Osimhen while Fulham’s Ola Aina got the nod ahead of Zaidu Sanusi.
But there were no goals between the two teams as they held each other for the second time in four days.