Vernyayev competed for the national team at the 2012 Summer Olympics in the men's artistic team all-around, alongside Nikolai Kuksenkov, Vitalii Nakonechnyi, Oleg Stepko and Igor Radivilov, and the men's artistic individual all-around. In qualification he scored 88.964 to finish in 13th place. In the team final Ukraine finished in 4th with a score of 271.526, missing out on a medal by less than 0.2 points. Ukraine were initially awarded 3rd place for a bronze medal, however following an appeal from Japan over a pommel horse score, they were awarded an extra 0.7 points, allowing them to move from 4th place to 2nd knocking Ukraine out of the medals in the process. He finished in 11th place in the individual all-around final with a score of 88.931.