Tunisia shocked Nigeria and Burkina Faso edged Gabon on Sunday to set up an Africa Cup of Nations last-eight showdown, while minnows Comoros prepared to use an outfield player as a goalkeeper when they confront hosts Cameroon.
Veteran Youssef Msakni scored two minutes into the second half to give previously unimpressive Tunisia a 1-0 second-round triumph over 10-man Nigeria in Garoua.
Nigerian hopes of levelling were dealt a huge blow midway through the second half when Alex Iwobi, initially yellow-carded for a stamp on Msakni, was sent off after the referee looked at the VAR monitor.
In the first last-16 match, Burkina Faso needed a penalty shootout to eliminate Gabon, who forced a 1-1 draw after extra time having played 56 minutes with 10 men following the red-carding of Sidney Obissa.
Substitute Ismahila Ouedraogo scored to give the Stallions a 7-6 shootout victory after Lloyd Palun had struck the woodwork for the gallant Gabonese in Limbe.
With all three goalkeepers unavailable due to positive Covid-19 tests and injury, giant-killers Comoros will place an outfield player between the posts when they tackle hosts Cameroon in Yaounde on Monday.
Whoever is chosen to don the gloves in Yaounde must face Vincent Aboubakar, the leading scorer so far in the flagship African tournament with five goals in three group matches.
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