Born in Kyiv, Yermakov is a product of the local Youth Sportive School #15,[2] where he was trained from 2015 until 2019. In August 2019 he was signed up by Shakhtar Donetsk and played in the Ukrainian Premier League Reserves. In March 2021 he went on loan to the Ukrainian Premier League club Oleksandriya and later, in July of the same year signed a permanent contract.
Yermakov made his debut for the main team of Oleksandriya on 26 September 2023 in a victorious (1:0) away match of the 1/8 finals of the Ukrainian Cup against Rukh lviv, when he entered the field in the starting lineup and played the entire match.[3]