Свой/Чужой

An important role in the life of "Zenith" was played by an irreconcilable confrontation with "Spartak." And the stories of Sergei Salnikov and Sergei Shvetsov, Vladimir Bystrov and Artem Dziuba, Pavel Pogrebnyak and Alexander Sobolev are full of similarities and differences. But what role did the "stranger" who became "his" play in the historical conquest of the UEFA Cup?