The Super Eagle was introduced in the second half of their home game as they claimed the advantage heading into the return leg
Nigeria international Henry Onyekuru was delighted to have made his debut for Olympiacos in their 3-0 Uefa Europa League victory over Slovan Bratislava on Thursday.
The 24-year-old, who joined the Greece giants from Ligue 1 club Monaco on a permanent deal, was introduced in the 74th minute for Mathieu Valbuena as his side took the advantage heading into the return leg fixture.
It was Guinea player Aguibou Camara who put Olympiacos ahead in the 37th minute before Senegal's Pape Cisse added the second in the 52nd minute for a 2-0 half-time lead at Georgios Karaiskakis Stadium.