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Schalke's midfielder Leon Goretzka (C-L) heads the ball next to Shakhtar's Croatian defender Darijo Srna during the UEFA Europa League round of 32 first leg football match between Shakhtar Donetsk and Schalke at Arena Lviv in Lviv on February 18, 2016. / AFP / SERGEI SUPINSKY (Photo credit should read SERGEI SUPINSKY/AFP via Getty Images)

Schalke's midfielder Leon Goretzka (C-L) heads the ball next to Shakhtar's Croatian defender Darijo Srna during the UEFA Europa League round of 32 first leg football match between Shakhtar Donetsk and Schalke at Arena Lviv in Lviv on February 18, 2016. / AFP / SERGEI SUPINSKY        (Photo credit should read SERGEI SUPINSKY/AFP via Getty Images)