In January 2019, Ollila joined Kotkan Työväen Palloilijat (KTP) in Ykkönen, and spent two seasons in Kotka, ultimately winning a promotion to Veikkausliiga with the club after the 2020 season.[5]
Ilves
On 1 January 2021, he moved to Ilves in premier division Veikkausliiga on a free transfer, after his contract with KTP had expired.[6] During two seasons with Ilves, Ollila made 50 appearances in all competitions combined, scoring 10 goals.
HJK Helsinki
Ollila transferred from Ilves back to his former youth club HJK Helsinki on 3 January 2023 on a two-year deal.[7][8] He made his debut and scored his first goal on 27 January in a 3–0 League cup win against IFK Mariehamn.[9]
Paris FC
On 29 January 2024, Ollila signed with French club Paris FC in Ligue 2, on a deal until June 2027, for an undisclosed transfer fee, rumoured to be €400,000.[10][11] On 10 March 2024 in his second appearance, Ollila scored his first goal for his new club, a winning goal in a 1–0 away win against Caen.[12]
Ollila has two brothers who are also football players, the elder Juuso Ollila and his twin Akseli Ollila, both of whom play for MPS/Atletico Malmi.[15] Growing up, he also played ice hockey with HIFK, before choosing football over it when aged 13.[3]
