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GELSENKIRCHEN, GERMANY - APRIL 20: Andre Onana of Ajax Amsterdam celebrates after a goal during the UEFA Europa League second leg quarter final soccer match between FC Schalke 04 and Ajax Amsterdam at the Veltins Arena in Gelsenkirchen, Germany on April 20, 2017. (Photo by Leon Kuegeler/Anadolu Agency/Getty Images)

GELSENKIRCHEN, GERMANY - APRIL 20: Andre Onana of Ajax Amsterdam celebrates after a goal during the UEFA Europa League second leg quarter final soccer match between FC Schalke 04 and Ajax Amsterdam at the Veltins Arena in Gelsenkirchen, Germany on April 20, 2017. (Photo by Leon Kuegeler/Anadolu Agency/Getty Images)