The winner of this match will progress to the last eight, where they will face either the seven-time champions Egypt or two-time winners Congo DR on February 2 at this venue.
Match preview
This year's Africa Cup of Nations has already provided a few shocks, and perhaps the biggest of those surprises came from Group A, where Equatorial Guinea defied the pre-tournament odds to win the group.
However, they were deserved winners as they held off African heavyweights Ivory Coast and Nigeria while managing an excellent tally of nine goals in their three matches, which was the most of any side in the group stages.
During the group-stage games, National Thunder drew 1-1 against The Super Eagles in their tournament opener but quickly found top gear to clinch a 4-2 win over Guinea-Bissau in match two before completely outplaying the Ivory Coast, beating The Elephants 4-0 in the final match of the group.
With those nine goals in the group stages, Juan Micha's side posted only two goals less than they managed in their first three tournaments combined (11 goals in 15 games in 2012, 2015, and 2021).
Equatorial Guinea have now reached the knockout stage in each of the last four AFCON competitions they have featured in (2012, 2015, 2021 and 2023) and are the only nation to have played and reached the knockouts in each of their AFCON appearances since the group stage was introduced back in 1963.
Meanwhile, Guinea faced a 2-0 defeat against reigning champions Senegal in their last match, but securing a 1-0 win against Gambia and a 1-1 draw with Cameroon earned them a spot in the round of 16 as one of the top four best-ranked third-placed teams in the competition.
The National Elephants have now scored just four goals in their last eight Africa Cup of Nations matches and never scored more than a single goal in any of the matches during that period.
This will mark the first time that Guinea faces this opponent, and it could turn out to be a titanic first meeting between two sides that are separated by just eight places in the FIFA world rankings, with Guinea currently ranked 80th and Equatorial Guinea placed 88th.
While the rankings may be in Kaba Diawara's side's favour, history is not, as they have suffered defeat in their last six AFCON knockout games and failed to score in the last four, including their round of 16 clashes in 2019 (3-0 against Algeria) and 2021 (1-0 against Gambia).
Based on form in the competition, The National Elephants are the clear underdogs heading into this one, and while they do have more AFCON experience than their opponents, it will not count for much here.
Equatorial Guinea Africa Cup of Nations form:
D
W
W
Equatorial Guinea form (all competitions):
W
W
D
D
W
W
Guinea Africa Cup of Nations form:
D
W
L
Guinea form (all competitions):
W
L
W
D
W
L
Team News
Micha has opted for the same starting lineup in Equatorial Guinea's last two matches, and considering the results in those games, it would come as no surprise if the head coach opted for an unchanged 11 again in this one.
Emilio Nsue, at the age of 34, scored five goals in the group stages and became the oldest player to score five or more goals in an AFCON, with Zambia's Kalusha Bwalya, who scored five in 1996, being the previous oldest aged 32.
Jose Machin also claimed a piece of history in the group stages as he became one of only three players to provide an assist in three consecutive AFCON matches, joining Yaya Toure and Martin Hongla, who achieved the same feat in 2012 and 2022, respectively.
For Guinea, Stuttgart attacker Serhou Guirassy returned from injury and managed to play an hour before he was withdrawn in the side's 2-0 defeat to Senegal last week.
Guirassy is expected to receive the nod again on Sunday and will likely receive support in attack from Liverpool's Naby Keita, who also sat out The National Elephants' first two matches due to injury.
Equatorial Guinea possible starting lineup:
Owono; Akapo, Obiang, Coco, Ndong; Salvador, Ganet, Bikoro, Miranda, Pepin; Nsue
Guinea possible starting lineup:
Kone; Diakite, Sow, M Camara, Sylla; Moriba, Diawara; A Camara, Keita, Conte; Guirassy
We say: Equatorial Guinea 2-0 Guinea
With the exception of Senegal and Morocco, Equatorial Guinea were possibly the most impressive team in the group stages of the competition and have the chance to send out a clear message to the big hitters remaining in the competition with a victory in this one.
Guinea have the experience advantage at this stage of the competition, but we feel that will not be enough to overcome The National Thunder in this match.