He was previously suspended by the National Hockey League (NHL) resulting in the Los Angeles Kings terminating Voynov's six-year, $25 million contract in 2015 but retaining his rights.

Voynov began his career with Traktor Chelyabinsk, playing his rookie Russian Superleague (RSL) season in 2006–07.

[3] On 20 October 2014, Voynov was suspended indefinitely pending an investigation by the NHL after being arrested on misdemeanor domestic violence charges against his wife Marta Varlamova.

[7] Although the CBA does not outline cases specific to Voynov and domestic violence, the league is able to suspend players while they are part of a criminal investigation.

"[9] On 16 December 2014, TMZ published a letter Varlamova wrote to the Los Angeles County District Attorney asserting that he had not intended to injure her and requesting that Voynov not be charged.

The motion was granted the day Voynov's three years of probation ended following his no contest plea to a misdemeanor charge of corporal injury to a spouse in 2015.

[12] He returned to Russia and signed a contract with Russian powerhouse club SKA Saint Petersburg, where he won a Gagarin Cup in 2017.

[16] On 23 May 2019, the NHLPA announced that independent arbitrator Shyam Das had determined Voynov's year-long suspension would be upheld, however he would be credited for time served and would only be suspended for 41 games of the 2019–20 season.

[17] Following the arbitration news, the Kings announced they did not have any intention of playing Voynov in the upcoming season and would be looking into cutting ties with him.

[20] On 20 May 2021, Voynov opted to continue his career in the KHL, agreeing to a two-year contract with HC Dynamo Moscow.

[23] Following two seasons with Ak Bars, Voynov mutually agreed to leave the club and was later signed to a one-year contract with Torpedo Nizhny Novgorod on 29 July 2024.