 While scoring 28 points in 56 games in his first season in Chelyabinsk, Polygalov was signed to a two-year contract extension on February 15, 2018.On July 16, 2019, Polygalov left Chelyabinsk to sign a one-year contract with his sixth top flight club, HC Dynamo Moscow.In his lone season under contract in 2019–20, he contributed with 8 goals and 14 points in 47 games.