Born in Kuopio, Siltanen started to play football in a youth team of the local club Kuopion Palloseura (KuPS). He made his senior debut in 2022 at the age of 15, with the club's reserve team KuPS II playing in the third tier league Kakkonen. After the 2022 season, Siltanen received the Boy Player of the Year award from the Eastern Finland Football Association.[1]
On 12 January 2023, Siltanen signed his first professional contract with the club, on a two-year deal with an option for an additional year.[2] He made his first team debut with KuPS on 11 February 2023, in a Finnish League Cup loss against Ilves.[3] In June, he spent time with Danish club AGF on trial.[4][5][6] After the 2023 season, Siltanen was named The Boy Player of the Year by the Football Association of Finland.[7][8]
Club career
On 6 April 2024, at the age of 17, Siltanen debuted in Veikkausliiga with KuPS first team, as a starter in the opening game of the 2024 season, in a 3–1 home win against HJK Helsinki.[9] He scored his first goal in the league on 7 July, in a 3–1 home win against IF Gnistan.[10] On 10 July, the club exercised his option for the 2025 season.[11] On 21 September, Siltanen and KuPS won the 2024 Finnish Cup title with a 2–1 win over Inter Turku in the final. On 19 October, Siltanen and KuPS were crowned the Veikkausliiga champions, completing the club's first-ever double.
In late 2024, Siltanen was noted by the CIES Football Observatory in the list of the most notable under-20 players in the world.[12][13][14] Subsequently he was named among the top 60 young talents in world football by The Guardian.[15][16] He became the third Finnish player to be mentioned in the said list, after Kaan Kairinen in 2015 and Sergei Eremenko in 2016.
During his debut season with KuPS first team, a 17-year-old Siltanen played in an important role and contributed in 42 matches, scoring a goal and providing five assists in total. He was also named Veikkausliiga Rookie of the Year.
International career
Siltanen was part of the Finland U16 squad that won the friendly tournament Baltic Cup in July 2023.[17]