He started his professional career in
Narva for
JK Narva Trans, where he scored 2 goals in 19 caps in
Meistriliiga. In January 2016, he moved to
Nõmme Kalju FC, where he played 24 games in 3 seasons and scored 3 goals in total. He was also on a short-term loan in
Tulevik, where he scored 2 goals in 19 games. In February 2021, he joined another
Meistriliiga side
Flora, where he scored 12 goals in 70 games in a span of 3 seasons. In February 2021, he joined a
Czech First League side
MFK Karviná, where he spent 17 months before joining
1. FC Slovácko. He spent 3 seasons in
Uherské Hradiště before joining
Bohemians 1905 in july 2025. On 6 January 2026, Sinyavskiy signed a three-year contract with
Baník Ostrava with option. ==International career==