Eibar recorded a 2-1 victory over Real Valladolid just before the international break, while Osasuna ran out 2-0 winners over Celta Vigo to move onto six points in the division.
Eibar have not actually played outside of La Liga since the 2013-14 campaign, while they finished ninth in 2017-18 before claiming 12th the season after during an excellent couple of years.
Jose Luis Mendilibar's side were 14th last term, which is the position that they currently occupy in the league, with a total of four points from their opening five matches of the season.
Eibar opened their 2020-21 campaign with a goalless draw against Celta before losing their next three away to Villarreal and at home to both Athletic Bilbao and Elche.
Los Armeros ran out 2-1 winners over Valladolid before the international break, though, with Kevin Rodrigues coming up with a 90th-minute strike to secure an impressive away success.
Osasuna, meanwhile, have picked up six points from their first four league matches of the season to occupy 11th position, recording two wins and suffering two defeats thus far.
Jagoba Arrasate's side opened their campaign with a 2-0 win at Cadiz before losing away to Getafe and at home to Levante in their next two towards the end of September.
Osasuna finished 10th in La Liga last season on their return to this level of football and were ultimately just four points off the Europa League spots during an impressive campaign.
Los Rojillos ran out 2-0 winners when they travelled to Eibar for the reverse match last season, while they also recorded a 3-2 victory in this particular fixture in October 2016.
Eibar La Liga form: DLLLW
Osasuna La Liga form: WLLW
Eibar will be without the services of central midfielder Papa Diop, with the 34-year-old picking up a straight red card during the victory over Valladolid before the international break.
Yoshinori Muto joined Eibar on loan from Newcastle United over the summer, and the 28-year-old should make his fourth appearance for the Spanish club in this match.
Eibar possible starting lineup:
Dmitrovic; Correa, Oliveira, Burgos, Soares; Inui, Exposito, Alvarez, Rodrigues; Garcia, Muto
Osasuna possible starting lineup:
Herrera; Roncaglia, D Garcia, Hernandez, Cruz; R Garcia, Moncayola, Sanjurjo, Jony; Gallego, Calleri
We say: Eibar 1-2 Osasuna
Osasuna are undefeated in their last eight matches against Eibar in all competitions, and we fancy the visitors to triumph on Sunday. Eibar have put in some encouraging displays this term, but Osasuna have a lot of quality in the forward positions, and we are backing Arrasate's side to collect all three points.