During 2015–2018, Silvennoinen managed a local club Savonlinnan Työväen Palloseura (STPS) in then fourth-tier Kolmonen.[1] In September 2018, he joined Italian club Giorgione Calcio as an assistant coach along with Gert Remmel and Iikka Miettinen, specializing in video and statistical analyses.[2][3]
Silvennoinen was the assistant coach of Toni Koskela in HJK Helsinki first team during the 2022 and 2023 seasons.[4] In January 2023, Silvennoinen was also named the assistant coach for Finland U21 national team in the coaching staff of Mika Lehkosuo.[5] After the dismissal of Koskela in July 2023, Silvennoinen left HJK and continued working with U21-national team until the end of 2023.[6]
On 8 November 2023, it was announced that Silvennoinen was appointed in the coaching staff of Veikkausliiga club AC Oulu, with Rauno Ojanen and Mikko Viitsalo, on a two-year deal, starting in 2024 season.[7][8][9][10] Due to his lack of UEFA Pro -coaching license, Silvennoinen is not eligible to work solely as a head coach in Veikkausliiga.[11][12] Silvennoinen and the whole coaching staff of AC Oulu were sacked on 13 June 2024 after 11 league matches, with a record of one win, five draws and five losses.[13][14]