Jaakko Oksanen joined Brentford in January 2018, signing on a two-and-a-half-year contract from HJK Helsinki. The holding midfielder made himself a strong part of the B squad almost from the very first time he played in red and white stripes.

Jaakko started his career in Finland as a youngster with a local team. He then joined the HJK Helsinki academy, playing for the reserve team Klubi 04 for the majority of his time in Scandinavia.

In October 2017, he made his debut in the Finnish league and played his only senior game for Helsinki aged 16. It was a 3-2 defeat to Rovanieman Palloseura in the Veikkausliiga.

He joined The Bees in January 2018, linking up with fellow young countryman Marcus Forss, as well as former Finland international goalkeeper and now B Team Goalkeeping Coach Jani Viander.

After adjusting to the language and the lifestyle, Jaakko started playing regularly for Kevin O'Connor's side towards the end of the 17/18 campaign.

He went on to make his first team debut on 5 May 2019 at the age of 18 in what was a 3-0 win for The Bees. He has made two appearances this season under Thomas Frank, against Reading and Stoke City.

Ahead of the 2020/21 season Jaakko joined Sky Bet League One side AFC Wimbledon on a season-long loan deal.