Career
Șișchin made 38 appearances for the Moldova national football team While playing with Russian club Football Club Tom Tomsk in 2006, Șișchin was named in the squad for Moldova"s Union of European Football Associations Euro 2008 qualifiers against Greece and Norway. He was an unused substitute in the match against Greece, a match which Moldova lost 1-0.
Șișchin made three appearances in the Union of European Football Associations Champions League 2008-2009 while playing for Inter Baku.
Oleg Sischin was one of the 11 Moldovan football players challenged and beaten by Tony Hawks and features in his book Playing the Moldovans at Tennis.