HJK Helsinki During the 2009 season, Ojala represented mostly
Klubi-04,
HJK's reserve squad. In the beginning of the 2010 season, however, he was selected to HJK's first eleven, due to various injuries in the squad. His performances were outstanding, and he quickly established himself as one of the key players in HJK's victorious 2010 campaign, playing in all games. Ojala became one of the best and most talented players in the
Veikkausliiga, and his performances provoked widespread international interest. At the end of the
2010 Veikkausliiga season, he was officially selected as the defender of the year.
Young Boys On 9 April 2011 Ojala signed a contract extension with HJK, the new contract running until 2014. But in July, HJK announced that Ojala would
transfer to Swiss team
BSC Young Boys on 13 August, for a transfer fee of €600,000. He gained notoriety in England during Young Boys'
2012–13 UEFA Europa League group stage match against
Liverpool at the
Stade de Suisse. In an eventful match, which ended 5–3 to the
Reds, Ojala opened the score with an own goal, putting the ball past
Marco Wölfli, his own goalkeeper. He later made amends by scoring a header to bring Young Boys level at 2–2 just after half time.
Terek Grozny After a year and a half in Switzerland on 12 February 2013 it was announced that Ojala would transfer to Russian Premier League team Terek Grozny, for a fee of €500,000.
Loan to HJK Helsinki On 29 July 2015, Ojala rejoined HJK on loan for the remainder of the
2015 Veikkausliiga season. He had a trial with
Coventry City at the end of the season, but was not signed.
SJK On 1 September 2016, Ojala signed with
SJK. He made his debut for SJK on 9 September 2016 playing full 90 minutes in a match against
Inter Turku.
Vejle On 26 August 2019,
Danish 1st Division club
Vejle Boldklub confirmed, that they had signed Ojala. He reached promotion to the
Danish Superliga during his first season at the club, and personally finished with 22 appearances in which he scored two goals.
Motherwell On 29 July 2021,
Motherwell announced the signing of Ojala on a two-year contract. Ojala left Motherwell by mutual consent on 1 September 2022, having played 24 times for the club.
Doxa Katokopias On 11 January 2023,
Doxa Katokopias announced the signing of Ojala.
Return to Finland After a short stint with
Honka in 2023, Ojala signed with newly promoted Veikkausliiga club
IF Gnistan ahead of the
2024 Veikkausliiga season. On 27 June 2025, Ojala made his 100th appearance in the league and scored his first goal for Gnistan, in a 2–2 home draw against
Inter Turku, with a long ball from the halfway line over the Inter goalkeeper
Eetu Huuhtanen. ==International career==