Shershun was born in a family of a football coach Mykola Shershun who served as an assistant coach with
Vitaliy Kvartsianyi in
Podillia and previously played at regional level and served as a referee for some time (1991–1993). Shershun started to play football at academy of the hometown's Podillia and later the Dnipro sports college. that was managed by
Vyacheslav Hroznyi and later
Mykola Fedorenko. he moved to play for
PFC CSKA Moscow but didn't play in the final. After Arsenal, Shershun signed with
Kryvbas Kryvyi Rih that was led by Vitaliy Kvartsianyi and later, after Kryvbas went bankrupt, along with Kvartsianyi transferred to
Volyn Lutsk. He said that he was not interested to continue his career in Azerbaijan and Kazakhstan, while does not want to go to Russia due to political situation. ==Honours==