Henry Onyekuru made his debut for Olympiacos, coming off the bench during the UEFA Europa League play-off match on Thursday.
Onyekuru was a second-half substitute as the Greek champion beat Slovan Bratislava 3-0 at the Georgios Karaiskakis Stadium.
With the hosts already 3-0 up, Olympiacos boss Pedro Martins handed his summer buy a run out to close what eventually was a comfortable win.
Mohamed Camara (37′), Pape Abou Cisse (52′) and Vasil Bozhikov’s (68′) own goal set the Red-Whites on their way to victory.
At the other end, Slovan Bratislava brought on Ezekiel Henty for Ibrahim Rabiu.
The second-leg of the tie comes up August 26 at the Tehelné pole in Bratislava.
