Since the relegation for financial reasons in 2010, AC Oulu played in Ykkönen for ten years, where it was considered as a candidate to promote for a long time.

During 2009–2014, the former Finland national team winger Mika Nurmela played for the club, and simultaneously worked as a sporting director in AC Oulu.

[3] In the 2021 Veikkausliiga season, after the run of poor results, the head coach Jyrki Ahola was sacked in September and replaced by Portuguese Ricardo Duarte.

In the early 2023, AC Oulu reached to the final of the pre-season Finnish League Cup tournament, after winning Inter Turku on penalties in the semi-final.

[8] Only a couple of weeks later, the club announced that Duarte was sacked with an immediate effect, following the loss in the 2023 Finnish Cup semi-final against Ilves, and the miserable results in the league.

[13] The team started the season poorly, and eventually the whole coaching staff was fired on 13 June 2024, after 11 league matches, with a record of one win, five draws and five losses.

[14] The team reached the quarter-finals of the 2024 Suomen Cup, but was knocked out by SJK 2–0 in the early July in the OmaSP Stadion in Seinäjoki.

[17] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.