Ojala made his international debut for Finland in November 2011, at the age of 22.
Club career
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.[4] At the end of the 2010 Veikkausliiga season, he was officially selected as the defender of the year.[5]
Young Boys
On 9 April 2011 Ojala signed a contract extension with HJK, the new contract running until 2014.[6] 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.[7]
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.[8]
Loan to HJK Helsinki
On 29 July 2015, Ojala rejoined HJK on loan for the remainder of the 2015 Veikkausliiga season.[9] 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.[10] He made his debut for SJK on 9 September 2016 playing full 90 minutes in a match against Inter Turku.[11]
Vejle
On 26 August 2019, Danish 1st Division club Vejle Boldklub confirmed, that they had signed Ojala.[12] He reached promotion to the Danish Superliga during his first season at the club,[13] and personally finished with 22 appearances in which he scored two goals.[14]
On 14 September 2020, his debut in the Superliga, he scored in a 4–2 loss to rivals AGF.[15]
Motherwell
On 29 July 2021, Motherwell announced the signing of Ojala on a two-year contract.[16] Ojala left Motherwell by mutual consent on 1 September 2022, having played 24 times for the club.[17]
^"Målfarlige AGF knækker Vejle i sæsonpremiere" (in Danish). TV 2. 14 September 2020. Retrieved 14 September 2020. Towards the end of the match, however, Vejle managed to score twice and create renewed tension. First, Ghanaian debutant Raphael Dwamena scored on a low strike from the edge of the box, and then Finnish Juhani Ojala came on the scoreboard with a header after a corner kick in the 84th minute.